* Adds Error Prone to the `pom.xml`
* Adds Error Prone annotations to avoid compiling errors
* Adds profile to run Error Prone in JDK8
* Revert "Adds profile to run Error Prone in JDK8"
This reverts commit 61771d0da55003ea5bc8c6f086d925aec583c9a2.
* Fix Error Prone warn
* Add comment to `pom.xml`
* Fix the `@SuppressWarnings("GetClassOnClass")`
* Replace the Error Prone link in the `pom.xml`
* Disable Error Prone with jdk-15`
* Remove a new-line in `pom.xml`
* Add CodeQL GitHub code scanning workflow
* Only compile main sources for code scanning
* Move test .proto files to test sources
`annotations.proto` also seems to be only relevant for tests because the test
explicitly registers them as extensions. By default the Proto adapter does not
consider them.
* Address some code scanning findings
* Fix some more findings
* Avoid NPE in PostConstructAdapterFactory
The RawType's Superclass might be null. This happens, for example, when the type is a collection.
* Add test case for NPE in PostConstructAdapterFactory
* Improve the code quality of PostConstructAdapterFactoryTest
* Improve the code quality of PostConstructAdapterFactoryTest
* Improve the code quality of PostConstructAdapterFactoryTest
