refactor: Remove unnecessary namespacing of fixtures.

[DanCardin]

All public API objects/functions are exposed at the top level and meant to be imported that way. So we should be able to safely reorganize internally.

I kept finding the odd difference in nesting level among the fixtures to be confusing and somewhat arbitrary (particularly when all of the supported fixtures live under "database" anyways) when making changes, so that's the idea of this change.

[codecov]

Codecov Report

Merging #167 (fe28e2a) into main (a28c490) will increase coverage by 0.08%.
The diff coverage is 97.61%.

@@            Coverage Diff             @@
##             main     #167      +/-   ##
==========================================
+ Coverage   82.84%   82.92%   +0.08%     
==========================================
  Files          30       29       -1     
  Lines        1306     1318      +12     
  Branches      187      191       +4     
==========================================
+ Hits         1082     1093      +11     
  Misses        183      183              
- Partials       41       42       +1     

Impacted Files	Coverage Δ
src/pytest_mock_resources/fixture/credentials.py	100.00% <ø> (ø)
src/pytest_mock_resources/sqlalchemy.py	92.71% <90.90%> (ø)
src/pytest_mock_resources/__init__.py	100.00% <100.00%> (ø)
src/pytest_mock_resources/fixture/__init__.py	100.00% <100.00%> (ø)
src/pytest_mock_resources/fixture/base.py	100.00% <100.00%> (ø)
src/pytest_mock_resources/fixture/mongo.py	100.00% <100.00%> (ø)
src/pytest_mock_resources/fixture/mysql.py	94.44% <100.00%> (ø)
src/pytest_mock_resources/fixture/postgresql.py	94.93% <100.00%> (ø)
src/pytest_mock_resources/fixture/redis.py	76.92% <100.00%> (ø)
...pytest_mock_resources/fixture/redshift/__init__.py	79.48% <100.00%> (ø)
... and 2 more

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[oakhan3]

This could be breaking for some, could you bump the version?