feat(ingest: add modifiers on capability on sources

[anshbansal]

• Merged docgen.sh into build.gradle
• Add SourceCapabilityModifier in subtypes.py which is a Union of all other subtypes
• Add subtype_modifier in capability annotation so we can have the sub type modifiers available programatically. This allows us to say we support coarse lineage for tables and stored procedures rather than just saying we support coarse lineage for the source.
• Update capability summary generation to add those subtype modifiers in the generated json file so it is available on frontend.
• Use the subtype modifiers to explicitly call out what types we support it for.

[codecov]

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Error parsing JUnit XML in /home/runner/work/datahub/datahub/metadata-io/build/test-results/test/TEST-com.linkedin.metadata.graph.search.opensearch.SearchGraphServiceOpenSearchTest.xml at 117:1052
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RuntimeError: Error converting computed name to ValidatedString
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    string is too long</code></pre>

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