Add isRecord and isNotRecord to Class assertions

[ljrmorgan]

Check List:

• Fixes NA
• Unit tests : YES
• Javadoc with a code example (on API only) : YES
• PR meets the contributing guidelines

Add isRecord() and isNotRecord() Class assertions.

As record only landed in Java 16 I'm having to use reflection to check whether the class is a record or not. I'm also only able to add unit tests for the negative cases, because I can't compile code that uses record.

If this is accepted I thought I'd also open a PR that adds a hasRecordComponents assertion.

[joel-costigliola]

Thanks @ljrmorgan, this one is better targeted to assertj 4.0 which will use java 17

[ljrmorgan]

Thanks @joel-costigliola! A Java 17 baseline would also remove all the reflection code, which would be great. Is there a 4.x branch or anything that I could rebase onto?

[scordio]

A Java 17 baseline would also remove all the reflection code, which would be great. Is there a 4.x branch or anything that I could rebase onto?

Not yet but as I mentioned I still think we could ship this in 3.x and change the implementation in 4.x.

@joel-costigliola how do you see it?

[joel-costigliola]

I can live with that

[scordio]

Thanks for your first contribution, @ljrmorgan!