Deep copy swerve module states before returning them

[person4268]

Fixes #5029. I don't mind taking a different approach if needed.

[person4268]

The CI failures seem to be network errors and unrelated to this PR. (./gradlew :wpimath:check builds and works fine on my machine)

[hadley31]

Based on discussion from #5134, I'd suggest repurposing this PR to remove the member variable entirely, since it is not used anywhere, and would remove the need to deep copy.

[person4268]

Based on discussion from #5134, I'd suggest repurposing this PR to remove the member variable entirely, since it is not used anywhere, and would remove the need to deep copy.

I'm tired, so I may be wrong, but isn't the member used to persist angle in case you command an all-zero ChassisSpeeds? That's why it exists, iirc.

[hadley31]

Ahh, I do see that now. However, I would argue that should be handled by the user, rather than the library, since it could possibly be used to calculate speeds other than the current robot state

[Starlight220]

If it's not used anywhere, what caused the issue that prompted this PR in the first place?

[calcmogul]

Superseded by #5398.