Added metrics for genai text

[kartik727]

Added AI-assisted metrics like coherence, fluency, etc. for generative text task types.

[codecov-commenter]

Codecov Report

Attention: 35 lines in your changes are missing coverage. Please review.

Comparison is base (66e33cb) 88.98% compared to head (9173474) 80.88%.

Files	Patch %	Lines
...leai_text/utils/genai_metrics/scripts/coherence.py	75.00%	6 Missing ⚠️
...ai_text/utils/genai_metrics/scripts/equivalence.py	75.00%	6 Missing ⚠️
...ibleai_text/utils/genai_metrics/scripts/fluency.py	75.00%	6 Missing ⚠️
...i_text/utils/genai_metrics/scripts/groundedness.py	75.00%	6 Missing ⚠️
...leai_text/utils/genai_metrics/scripts/relevance.py	75.00%	6 Missing ⚠️
...bleai_text/utils/genai_metrics/scripts/_compute.py	86.95%	3 Missing ⚠️
.../responsibleai_text/utils/genai_metrics/metrics.py	84.61%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2514      +/-   ##
==========================================
- Coverage   88.98%   80.88%   -8.10%     
==========================================
  Files         134       34     -100     
  Lines        7745     2480    -5265     
==========================================
- Hits         6892     2006    -4886     
+ Misses        853      474     -379     

Flag	Coverage Δ
unittests	80.88% <77.98%> (-8.10%)	⬇️

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