refactor: serde privileges

[de-sh]

Fixes #XXXX.

Description

This is a draft to figure out why the ingestion PR was failing and to discuss what needs to be fixed

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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 12855391180

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 15 (0.0%) changed or added relevant lines in 4 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.001%) to 12.713%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/handlers/http/cluster/mod.rs	0	2	0.0%
src/handlers/http/modal/query/querier_role.rs	0	4	0.0%
src/handlers/http/role.rs	0	4	0.0%
src/handlers/http/modal/ingest/ingestor_role.rs	0	5	0.0%

Totals
Change from base Build 12852557722:	-0.001%
Covered Lines:	2459
Relevant Lines:	19342

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💛 - Coveralls