RSPEED-270 - Add sqlalchemy db connection

[andywaltlova]

• added sqlalchemy
• added connection to postgres database based on env variables
• changed endpoint to use tsvector search instead of naive keyword search

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 61.11111% with 14 lines in your changes missing coverage. Please review.

Project coverage is 51.78%. Comparing base (dd4a78f) to head (e9a2bf5).

Files with missing lines	Patch %	Lines
app/v1/released/endpoints.py	41.66%	7 Missing ⚠️
app/crud.py	37.50%	5 Missing ⚠️
app/database.py	75.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main       #3       +/-   ##
===========================================
- Coverage   76.53%   51.78%   -24.75%     
===========================================
  Files           9       10        +1     
  Lines          98      112       +14     
===========================================
- Hits           75       58       -17     
- Misses         23       54       +31     

Flag	Coverage Δ
unittests	51.78% <61.11%> (-24.75%)	⬇️

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