feat: standardize field names for counts API

[de-sh]

Fixes #XXXX.

Description

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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 12827071990

Details

• 0 of 8 (0.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.006%) to 12.777%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/handlers/http/query.rs	0	4	0.0%
src/query/mod.rs	0	4	0.0%

Totals
Change from base Build 12823516428:	0.006%
Covered Lines:	2459
Relevant Lines:	19245

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💛 - Coveralls