feat(cockroachdb): add support upsert

[intech]

Add support upsert() for CockroachDB
Docs: upsert
Related: #2002

[kibertoad]

This also needs documentation at https://github.com/knex/documentation

[intech]

This also needs documentation at https://github.com/knex/documentation

How do I indicate in the documentation that this implementation is for CockroachDB only

[kibertoad]

@intech Just add it in text description that it only works with crdb.

[intech]

@intech Just add it in text description that it only works with crdb.

Done

[kibertoad]

Could you also please update TS types?

[intech]

@kibertoad I think I need your help with this

[kibertoad]

@intech Sure, what can I help with?

[intech]

@intech Sure, what can I help with?

With linting errors for TS in tests. I have little experience with TS

[intech]

@kibertoad Nice, thx! Now I saw my mistake.

[kibertoad]

Created issue to incrementally support Upsert across dialects: #4769

[kibertoad]

Thank you for your contribution!