[DeprecatedApiUsage] Suppress within deprecated methods/classes

[aldexis]

Recreated from palantir/gradle-baseline#3392

Before this PR

The Java compiler actually suppresses the deprecation warnings when within a deprecated method or class. This makes sense since deprecating using a deprecated api is a valid way to handle the deprecation if handling the deprecation requires doing an ABI break (e.g. by passing another argument).

After this PR

==COMMIT_MSG==
[DeprecatedApiUsage] Suppress within deprecated methods/classes
==COMMIT_MSG==

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Type (Select exactly one)

• Feature (Adding new functionality)
• Improvement (Improving existing functionality)
• Fix (Fixing an issue with existing functionality)
• Break (Creating a new major version by breaking public APIs)
• Deprecation (Removing functionality in a non-breaking way)
• Migration (Automatically moving data/functionality to a new system)

Description

[DeprecatedApiUsage] Suppress within deprecated methods/classes

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💡 Improvements

• [DeprecatedApiUsage] Suppress within deprecated methods/classes (#18)