Add True Negative Rate (TNR)

[fcogidi]

PR Type

Feature.

Short Description

Add TNR metric (alias of specificity) to experimental metrics module.

Tests Added

None.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (2fcfec6) 68.64% compared to head (d05a2b2) 68.67%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #541      +/-   ##
==========================================
+ Coverage   68.64%   68.67%   +0.02%     
==========================================
  Files         108      108              
  Lines       10168    10177       +9     
==========================================
+ Hits         6980     6989       +9     
  Misses       3188     3188              

Files	Coverage Δ
...ate/metrics/experimental/functional/specificity.py	100.00% <100.00%> (ø)
...clops/evaluate/metrics/experimental/specificity.py	100.00% <100.00%> (ø)