Add concord_index calculation into DeepDTA

[peizhenbai]

Description

• Add CI calculation into deep_dti pipeline
• Add CI metric test case (test_deep_dti)
• Rename c_index to concord_index
• Add default lr value

Status

*Ready

Types of changes

• Non-breaking change (fix or new feature that would not break existing functionality).
• New tests added to cover the changes.
• In-line docstrings updated.

[codecov-commenter]

Codecov Report

Merging #157 (8de2004) into main (6eb6e56) will increase coverage by 0.27%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #157      +/-   ##
==========================================
+ Coverage   88.08%   88.36%   +0.27%     
==========================================
  Files          44       44              
  Lines        4156     4167      +11     
==========================================
+ Hits         3661     3682      +21     
+ Misses        495      485      -10     

Impacted Files	Coverage Δ
kale/evaluate/metrics.py	91.66% <100.00%> (+91.66%)	⬆️
kale/pipeline/deep_dti.py	90.00% <100.00%> (+0.20%)	⬆️

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