PostgreSQL: add DatabaseConfiguration

[pascalgrimaud]

Fix #273

[codecov]

Codecov Report

Merging #287 (858c72a) into main (e62411a) will not change coverage.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##                main      #287   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity       454       454           
===========================================
  Files             80        80           
  Lines           1453      1452    -1     
  Branches          32        32           
===========================================
- Hits            1453      1452    -1     

Impacted Files	Coverage Δ
...esql/application/PostgresqlApplicationService.java	100.00% <100.00%> (ø)
...ase/postgresql/domain/PostgresqlDomainService.java	100.00% <100.00%> (ø)

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