✨ webserver-catalog rpc connection

[pcrespov]

What do these changes do?

This PR exposes an rpc interface in the catalog and uses it in the webserver.

catalog

• setup rabbitmq
• ✨ new rcp server
  • implemented with fakes until coming PR

webserver's catalog plugin

• _rpc client
• _api module (service layer):
  • get catalog _rpc results and aggregates i/o
• rest _handlers (controller layer)
  • implemented using _api

Related issue/s

• Part of #5964

How to test

• tests rest entrypoints mocking catalog's _rpc client calls

  cd services/web/server/
  make install-dev
  pytest -vv tests/unit/with_dbs/01/test_catalog_handlers__services.py:test_dev_get_and_patch_service

Dev-ops checklist

• catalog service now interacts with rabbitmq. Added RABBITMQ_ related env-vars. No changes required in osparc-ops!

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 55.63380% with 63 lines in your changes missing coverage. Please review.

Project coverage is 83.9%. Comparing base (cafbf96) to head (63af428). Report is 308 commits behind head on master.

Additional details and impacted files

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