Implement `:bulk/create` action for SQL JDBC. Tons of bug fixes (#23878)

* Actions multimethod refactor.

* Fix function called with wrong number of args

* Test fixes

* Bulk create action (second pass)

* Appease clj-kondo

* Fix bulk insert happy path

* Implement/fix everything

* Linter and test fixes 



* Fix bad metadata (thanks Eastwood!)

* Add some comments about why we're doing what we're doing

* Serdes v2 for Native Query Snippets (#23961)

Also standardizes date/time output to `ZonedDateTime`, rather than whatever the JDBC happens to return.

Co-authored-by: Braden Shepherdson <Braden.Shepherdson@gmail.com>