Fix interface member detection to support inner records

[rnorth]

What changed with this PR:

This PR is intended to fix an error when parsing interfaces with inner records.

Example

Before fix

// Input
public interface SomeInterface {
  record SomeRecord(
      String param
  ) implements AnyInterface { }
}
// Output

AssertionError: expected [Function] to not throw an error but 
Error: Sad sad panda, parsing errors detected in line: 5, column: 9!
Expecting: one of these possible Token sequences:\n  1. [\'{\'] 2. [\';\']
  but found: \'implements\'!
->compilationUnit
->ordinaryCompilationUnit
->typeDeclaration
->interfaceDeclaration
->normalInterfaceDeclaration
->interfaceBody
->interfaceMemberDeclaration
->interfaceMethodDeclaration
->methodBody' was thrown

As I understand it, interfaceMemberDeclaration->interfaceMethodDeclaration is a sign that the inner record is being identified as a method declaration, when it should be identified as a 'class' (record) definition.

After fix

Parses without throwing

Relative issues or prs:

None filed; I'd be happy to file one retrospectively if needed.

[CLAassistant]

All committers have signed the CLA.

[clementdessoude]

Hi @rnorth !!

Thanks a lot for this PR ! It's awesome :)

[rnorth]

@clementdessoude I'm sorry to ask, but is there any possibility of triggering a patch release for this?

Or do you know of any way to use an unreleased version with the spotless Gradle plugin? (I've tried but it doesn't seem this is possible)

Thank you!

[clementdessoude]

Sorry, I should have done it right after merging the PR, and then I was away for some holidays. It should be good now :)

[rnorth]

Awesome, I was on vacation myself but am back now and will give it a spin. Thanks so much!