feat: support both base conf and app conf

[ab93]

• Add support for base config and app config merge
• Throw an error if no conf exists
• Paths can be altered using env vars

[codecov[bot]]

Codecov Report

Attention: 18 lines in your changes are missing coverage. Please review.

Comparison is base (c967f20) 94.19% compared to head (6c99575) 93.78%. Report is 1 commits behind head on main.

Files	Patch %	Lines
numalogic/udfs/trainer/_prom.py	60.00%	14 Missing :warning:
numalogic/connectors/redis.py	33.33%	1 Missing and 1 partial :warning:
numalogic/udfs/__main__.py	87.50%	1 Missing :warning:
numalogic/udfs/trainer/_base.py	50.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #328 +/- ## ========================================== - Coverage 94.19% 93.78% -0.42% ========================================== Files 76 79 +3 Lines 3482 3570 +88 Branches 282 292 +10 ========================================== + Hits 3280 3348 +68 - Misses 157 176 +19 - Partials 45 46 +1 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

[sarabala1979]

@ab93 Will Code load the new file if there is a config change? similar https://github.com/numaproj/numalogic-prometheus/pull/119

[ab93]

@ab93 Will Code load the new file if there is a config change? similar numaproj/numalogic-prometheus#119

@sarabala1979 no it won't here. Added a new issue to track it.