✨ New repository helpers on asyncpg

[pcrespov]

What do these changes do?

This PR implements some helper functions to build repositories effectively on top of asyncpg, which is going to be the replacement of aiopg in the entire repo (see #4529)

• ✅ New test fixtures to create asyncpg engine in simcore-postgres-database library tests
• ✨ New utility functions to build repositories and create transactions. Specifically, two context managers:
  • pass_or_acquire_connection: returns an connection or acquires a new one. If the latter, it gets destroyed on exit.
  • transaction_contexts: allows (i.e., database units of work) also across multiple repository calls.
    • NOTE that up to now we could only do this within a single repository call at a time!
  • IMPORTANT: for a better insight see tests/test_utils_repos.py
• ⚗️ Prototypes of "template" repository class OneResourceRepoDemo using aforementioned utils in tests/test_utils_repos.py. This class also demonstrate how the utils above can be used to build repositories
• 🗑️ Vendor.has_landing_page was retired

Related issue/s

• Part of migrate code from aiopg to asyncpg #4529

How to test

cd packages/postgres-database
make install-dev
pytest -vv tests/test_utils_repos.py

Dev-ops checklist

• No ENV changes or I properly updated ENV (read the instruction)

[codecov]

Codecov Report

Attention: Patch coverage is 96.42857% with 1 line in your changes missing coverage. Please review.

Project coverage is 82.5%. Comparing base (cafbf96) to head (fc478c4).
Report is 600 commits behind head on master.

Files with missing lines	Patch %	Lines
...abase/src/simcore_postgres_database/utils_repos.py	96.4%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           master   #6465      +/-   ##
=========================================
- Coverage    84.5%   82.5%    -2.1%     
=========================================
  Files          10    1403    +1393     
  Lines         214   58184   +57970     
  Branches       25    1367    +1342     
=========================================
+ Hits          181   48029   +47848     
- Misses         23    9972    +9949     
- Partials       10     183     +173     

Flag	Coverage Δ
unittests	82.5% <96.4%> (-2.1%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...e/src/simcore_postgres_database/models/products.py	100.0% <ø> (ø)
...r/src/simcore_service_webserver/products/_model.py	91.5% <ø> (ø)
...abase/src/simcore_postgres_database/utils_repos.py	96.4% <96.4%> (ø)

... and 1350 files with indirect coverage changes

[matusdrobuliak66]

Very nice thanks!

[GitHK]

👍 looking good, please find below once concern about a test

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud