Add AnswerExactMatchEvaluator

[silvanocerza]

Related Issues

• fixes Implement function to calculate Exact Match metric #6067

Proposed Changes:

Add AnswerExactMatchEvaluator. This Component calculates the Exact Match metrics given a list of questions, a list of expected answers for each question and the list of predicted answers for each question.

How did you test it?

I added unit tests.

Notes for the reviewer

N/A

Checklist

• I have read the contributors guidelines and the code of conduct
• I have updated the related issue with new insights and changes
• I added unit tests and updated the docstrings
• I've used one of the conventional commit types for my PR title: fix:, feat:, build:, chore:, ci:, docs:, style:, refactor:, perf:, test:.
• I documented my code
• I ran pre-commit hooks and fixed any issue

[coveralls]

Pull Request Test Coverage Report for Build 8006956131

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.004%) to 89.806%

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Totals
Change from base Build 8006113790:	0.004%
Covered Lines:	5180
Relevant Lines:	5768

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💛 - Coveralls

[shadeMe]

Some minor changes, but LGTM otherwise! Let's also get @julian-risch to sign off.

[shadeMe]

Now that the metrics are (in)directly associated with specific upstream components, I don't think we need an additional statistical submodule after all.

[julian-risch]

LGTM! 👍 The docstring describes the metric really well and the implementation of the metric is easy to read and correct. 👍