refactor: use clap::Parser for readability

[de-sh]

Fixes #XXXX.

Description

This has been in the works for long, finally figured out how to simplify the flow and get rid of the "junk" code involving unnecessary arg matching(totally my opinion), but this I believe is a readability win for the CLI and should allow us to work on further modularizing the codebase. It still needs a bit of testing to ensure parity with previous implementation.

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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 12753670183

Details

• 1 of 202 (0.5%) changed or added relevant lines in 37 files are covered.
• 8 unchanged lines in 3 files lost coverage.
• Overall coverage increased (+0.3%) to 12.684%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/about.rs	0	1	0.0%
src/handlers/http/llm.rs	0	1	0.0%
src/handlers/http/mod.rs	0	1	0.0%
src/handlers/http/modal/ingest_server.rs	0	1	0.0%
src/handlers/http/modal/utils/logstream_utils.rs	0	1	0.0%
src/handlers/http/oidc.rs	0	1	0.0%
src/handlers/http/query.rs	0	1	0.0%
src/query/mod.rs	0	1	0.0%
src/utils/arrow/flight.rs	0	1	0.0%
src/alerts/mod.rs	0	2	0.0%

Files with Coverage Reduction	New Missed Lines	%
src/handlers/http/modal/mod.rs	1	31.65%
src/audit.rs	1	0.0%
src/cli.rs	6	0.0%

Totals
Change from base Build 12753189913:	0.3%
Covered Lines:	2408
Relevant Lines:	18985

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💛 - Coveralls

[nikhilsinhaparseable]

looks good