Expose Object serialization for internal consumers

[schmidt-sebastian]

This allows internal teams to create DocumentSnapshots from POJOs, Maps and the Proto.

[codecov]

Codecov Report

Merging #6085 into master will decrease coverage by 7.03%.
The diff coverage is 0%.

@@ Coverage Diff @@## master #6085 +/- ##
============================================
- Coverage 47.38% 40.35% -7.04% + Complexity 27182 25716 -1466 
============================================
Files 2523 2524 +1 Lines 274581 220912 -53669 Branches 31380 24175 -7205 ============================================
- Hits 130123 89138 -40985 + Misses 134850 123333 -11517 + Partials 9608 8441 -1167

Impacted Files	Coverage Δ	Complexity Δ
...a/com/google/cloud/firestore/DocumentSnapshot.java	84.76% <0%> (-0.96%)	55 <2> (ø)
...main/java/com/google/cloud/firestore/Internal.java	0% <0%> (ø)	0 <0> (?)
...ud/devtools/containeranalysis/v1/GrafeasUtils.java	50% <0%> (-40.91%)	1% <0%> (ø)
...oogle/cloud/spanner/jdbc/JdbcDatabaseMetaData.java	61.9% <0%> (-22.97%)	145% <0%> (ø)
...afeas/src/main/java/io/grafeas/v1/GrafeasGrpc.java	48.32% <0%> (-18.89%)	30% <0%> (ø)
...om/google/cloud/http/BaseHttpServiceException.java	44.23% <0%> (-17.31%)	8% <0%> (ø)
...le/cloud/compute/v1/stub/HttpJsonNodeTypeStub.java	73.52% <0%> (-16.67%)	9% <0%> (-1%)
...le/cloud/compute/v1/stub/HttpJsonDiskTypeStub.java	73.52% <0%> (-16.67%)	9% <0%> (-1%)
...cloud/compute/v1/stub/HttpJsonMachineTypeStub.java	73.52% <0%> (-16.67%)	9% <0%> (-1%)
...google/cloud/compute/v1/stub/HttpJsonZoneStub.java	71.42% <0%> (-16.08%)	8% <0%> (-1%)
... and 1908 more

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[schmidt-sebastian]

@BenWhitehead Is there anything special I need to do regarding the formatting? I have re-installed my Maven dependencies and mvn com.coveo:fmt-maven-plugin:format doesn't show me a diff anymore, yet the verification still fails.

[schmidt-sebastian]

@BenWhitehead Is there anything special I need to do regarding the formatting? I have re-installed my Maven dependencies and mvn com.coveo:fmt-maven-plugin:format doesn't show me a diff anymore, yet the verification still fails.

To be clear, it did format the change the first time around.

[BenWhitehead]

@schmidt-sebastian The new file https://github.com/googleapis/google-cloud-java/pull/6085/files#diff-c1b66da3ed37700b15f5fb4c57e0328dR1 looks like it's missing a copyright header and that's why it's failing.

[schmidt-sebastian]

Thanks :) It's passing now.