feat: provide spotbugs annotation processor to consumers

[stevecl5]

Summary of Changes

Added spotbugs-annotations annotation processor dependencies for plugin consumers. This is necessary in order for consumers to generate code with the @SuppressFBWarnings annotation.

Public API Additions/Changes

N/A

Downstream Consumer Impact

Downstream consumers (such as path-core:gateway-generator) will be able to generate code with the @SuppressFBWarnings annotation without manually adding the annotation processor dependency.

How Has This Been Tested?

I pulled a snapshot version into path-core and ran ./gradlew dependencies --write-locks, verifying that the annotationProcessor and testAnnotationProcessor are included by default in the gradle.lockfile.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works