Remove unnecessary comparable type constraints from data structures

[sleepymole]

Close https://github.com/emirpasic/gods/issues/243.

Some data structures support custom comparators. In these cases, the generic type constraint does not need to be comparable. This PR removes the unnecessary comparable type constraints from these data structures.

[sonarqubecloud[bot]]

Quality Gate passed

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[Seb-C]

I also need this if I want to migrate to the v2. When can we expect a review?

[doraemonkeys]

@emirpasic Could you please review and consider merging it soon?