Print cache stats with --times

[majocha]

Description

When compiling with --times option, print also collected cache metrics in tabular form.
Currently it just prints hit ratio and some raw event counts.

 ...
|>Writing Image | 32.0912| 0.0011| 2444| 0| 0| 0| 510| 50|
|>Finalize PDB | 32.0931| 0.0000| 2444| 0| 0| 0| 509| 50|
|>Signing Image | 32.0949| 0.0000| 2444| 0| 0| 0| 509| 50|
|>Generate PDB Info | 32.0962| 0.0000| 2444| 0| 0| 0| 509| 50|
|Write .NET Binary | 32.0976| 3.8032| 2444| 5| 4| 2| 509| 50|
--------------------------------------------------------------------------------------------------------
-------------------------------------------------------------------------------------------------------------
| Cache name | hit-ratio | adds | updates | hits | misses | evictions | eviction-fails |
|----------------------|-----------|----------|----------|----------|----------|-----------|----------------|
| typeSubsumptionCache | 69.28% | 129286 | 0 | 291513 | 129286 | 0 | 0 |
-------------------------------------------------------------------------------------------------------------

Also reenable debug display showing the metrics for individual instances when debugging.

[github-actions]

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cc @dotnet/fsharp-team-msft