✨Set IsAotCompatible for net7.0 or later

[OleRoss]

Fixes IL warnings when building with AOT.

• Add EnumHelper.GetValues<> to simplify enumerating enum values for netstandard and net7+, AOT compatible
• Replace reflection in UnitConverter.RegisterDefaultConversions() with generated code in Quantity.DefaultProvider.RegisterUnitConversions()
• Add attributes to warn about incompatibilities to Native AOT compilation for UnitsNet.Serialization.JsonNet, requires more changes

I tried to make minimal changes only, but possibly breaking changes are

• the addition of a struct constraint to generic enum-constrained methods

[OleRoss]

@angularsen I rebased on the current master - it was much easier due to the latest commits

And, just for fun, I added a startup performance comparison :)

Default startup performance (PerfTest_Startup):

| Name | Mean | StdDev | StdErr | Min | Max | P95 | P90 | Outliers |
| --------- | --------------- | ------------- | ------------ | --------------- | --------------- | --------------- | --------------- | -------- |
| Default | 2463,4326ms | 386,9283ms | 88,7674ms | 1930,7473ms | 3242,5405ms | 3182,9327ms | 3017,8285ms | 1 |

NativeAot compilation startup performance (PerfTest_Startup_Aot):

| Name | Mean | StdDev | StdErr | Min | Max | P95 | P90 | Outliers |
| ------- | --------- | -------- | --------- | ---------- | ---------- | ---------- | --- | -------- |
| Default | 186,438ms | 47,942ms | 10,9986ms | 280,4149ms | 279,2135ms | 275,9632ms | 1 | |

[lipchev]

@angularsen I rebased on the current master - it was much easier due to the latest commits

And, just for fun, I added a startup performance comparison :)

Default startup performance (PerfTest_Startup):

| Name | Mean | StdDev | StdErr | Min | Max | P95 | P90 | Outliers |
| --------- | --------------- | ------------- | ------------ | --------------- | --------------- | --------------- | --------------- | -------- |
| Default | 2463,4326ms | 386,9283ms | 88,7674ms | 1930,7473ms | 3242,5405ms | 3182,9327ms | 3017,8285ms | 1 |

NativeAot compilation startup performance (PerfTest_Startup_Aot):

| Name | Mean | StdDev | StdErr | Min | Max | P95 | P90 | Outliers |
| ------- | --------- | -------- | --------- | ---------- | ---------- | ---------- | --- | -------- |
| Default | 186,438ms | 47,942ms | 10,9986ms | 280,4149ms | 279,2135ms | 275,9632ms | 1 | |

@OleRoss I haven't been able to do my own aot-enabled publish (haven't installed the c++ stuff yet), but am very curious to see how the 🐲 version performs: if you got the time, could you please run it against this PR: #1544

[OleRoss]

@lipchev, sure, I played around with it, but had difficulties getting comparable results ...

I ended up creating a benchmark class which starts a process and waits for completion:

Run 1: IterationCount=20 LaunchCount=8 WarmupCount=5
| Method | Mean | Error | StdDev |
|------------------------------- |---------:|--------:|---------:|
| MeasureStartupQuantityValue | 869.8 ms | 6.28 ms | 23.37 ms |
| MeasureStartupQuantityValueAot | 204.2 ms | 3.39 ms | 12.59 ms |
| MeasureStartupMaster | 491.9 ms | 3.51 ms | 12.75 ms |
| MeasureStartupMasterAot | 171.7 ms | 1.48 ms | 5.49 ms |
Run 2: IterationCount=20 LaunchCount=8 WarmupCount=5
| Method | Mean | Error | StdDev | Median |
|------------------------------- |---------:|--------:|---------:|---------:|
| MeasureStartupMaster | 535.9 ms | 4.45 ms | 16.33 ms | 534.7 ms |
| MeasureStartupMasterAot | 181.8 ms | 9.68 ms | 36.27 ms | 173.1 ms |
| MeasureStartupQuantityValue | 798.5 ms | 7.67 ms | 28.29 ms | 792.3 ms |
| MeasureStartupQuantityValueAot | 200.9 ms | 1.78 ms | 6.60 ms | 199.7 ms |

Between Run 1 and Run 2, I changed the order of the tests; Somehow, the tests seem to be affected by this, but I think the trend is clear.

Apart from that, those are the results using timeitsharp (very inconsistent, just for completeness):

fractional-quantity-value:
| Name | Mean | StdDev | StdErr | Min | Max | P95 | P90 | Outliers |
| ----------- | ----------- | ----------- | ----------- | ----------- | ----------- | ----------- | ---------- | -------- |
| Default | 1737,353ms | 321,2004ms | 73,6884ms | 1378,0007ms | 2417,7457ms | 2345,5968ms | 2174,4889m | 1 |
fractional-quantity-value AOT:
| Name | Mean | StdDev | StdErr | Min | Max | P95 | P90 | Outliers |
| ------- | ---------- | --------- | -------- | ---------- | --------- | ---------- | --- | -------- |
| Default | 106,8239ms | 11,6117ms | 2,7369ms | 142,3908ms | 136,828ms | 118,7921ms | 2 | |
master:
| Name | Mean | StdDev | StdErr | Min | Max | P95 | P90 | Outliers |
| ----------- | ----------- | ----------- | ----------- | ---------- | ----------- | ----------- | ----------- | -------- |
| Default | 955,7565ms | 200,4313ms | 45,9821ms | 739,7095ms | 1324,9328ms | 1324,5596ms | 1312,1677ms | 1 |
master AOT:
| Name | Mean | StdDev | StdErr | Min | Max | P95 | P90 | Outliers |
| ------- | ---------- | --------- | -------- | ---------- | -------- | ---------- | --- | -------- |
| Default | 108,8349ms | 10,5986ms | 2,3699ms | 127,2372ms | 125,85ms | 123,0387ms | 0 | |

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[angularsen]

Apologies, I've been away for some time. What is the state of this

[angularsen]

Merged with latest master, separated out some diffs to make the PR more succinct. LGTM.

[OleRoss]

Thanks for taking the time and merging @angularsen

[angularsen]

Better late than never, I've heard 🙈

[angularsen]

Release UnitsNet/6.0.0-pre016 · angularsen/UnitsNet