#2 Add Flags for Aggregation and Verbosity

[djokester]

1. Added test case for attempting to load base_metric through evaluator
2. Added argument for aggregation function for score and their test cases.
3. Added argument verbose to enable logging of the decomposition of text and subsequent scoring breakdown
4. Moved the score function to the base_class to reduce repetitions
5. Updated badges in the readme as well as some non-performant sections.
6. Updated README.md to reflect the changes made to verbosity and aggregation.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 96.93878% with 3 lines in your changes missing coverage. Please review.

Project coverage is 98.78%. Comparing base (9b92ca1) to head (146da17).

Files	Patch %	Lines
groqeval/metrics/base_metric.py	92.50%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #9      +/-   ##
==========================================
+ Coverage   97.35%   98.78%   +1.42%     
==========================================
  Files          11       11              
  Lines         302      328      +26     
==========================================
+ Hits          294      324      +30     
+ Misses          8        4       -4     

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