MAINT: rename query_target methods to query_object be consistent with the rest of the API

I've noticed the API inconsistency in `esa.hubble` and `esa.jwst` to use the name `query_target` as opposed to what we do in the rest of the package.

I suppose we could rename (with appropriately long deprecation for the old names) to make the API more consistent.

cc @jespinosaar

Start by locating the query_target methods in esa.hubble and esa.jwst and compare them with the rest of the package's API naming. Confirm the deprecation period and compatibility expectations with maintainers; done means query_object is the consistent public name, old names remain deprecated as agreed, and relevant tests pass.

Written by the indexing model from the issue text.