* removing implicit dependency with libpq if postgres is not being used.
* We only run the postgres tests when explicitly willing to, i.e. make
POSTGRES=1 test. The reason is that the postgres tests expect a
database instance to be running locally.
* chore: remove v1 code
* chore: deprecate support for v1 compatibility from JSON-RPC API
* chore: remove v1 tests from JSON-RPC suite
* chore: remove wakubridge code
* chore: remove v1 compatibility functions
* chore: remove support for v1 payloads from chat2 app
* chore: remove v1 from CI processes
* fix: lingering references to private API functions
* fix: remove v1 compat from chat2
* fix: some more lingering references in tests
* Refactoring the Waku Archive. Simplifying the app.nim
This change is needed to accommodate the further PRs where we will integrate Postgres in `wakunode2`.
