refactor: Correlations

[de-sh]

Fixes #XXXX.

Description

• Use Deref, enables changing self.0 ~> self.
• Use HashMap to enable quick retreival.
• Encapsulate mutations into a single method.

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This PR has:

• been tested to ensure log ingestion and log query works.
• added comments explaining the "why" and the intent of the code wherever would not be obvious for an unfamiliar reader.
• added documentation for new or modified features or behaviors.

[coveralls]

Pull Request Test Coverage Report for Build 12851512851

Details

• 0 of 102 (0.0%) changed or added relevant lines in 2 files are covered.
• 7 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+0.01%) to 12.726%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/handlers/http/correlation.rs	0	27	0.0%
src/correlation.rs	0	75	0.0%

Files with Coverage Reduction	New Missed Lines	%
src/handlers/http/correlation.rs	3	0.0%
src/correlation.rs	4	0.0%

Totals
Change from base Build 12850824320:	0.01%
Covered Lines:	2459
Relevant Lines:	19323

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💛 - Coveralls