fix!: rename query endpoints to be all in kebab-case

[RiccardoM]

Description

This PR improves the REST query endpoints to be all in kebab-case instead of being partially in snake_case.

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Author Checklist

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I have...

• included the correct type prefix in the PR title
• added ! to the type prefix if API or client breaking change
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• provided a link to the relevant issue or specification
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• included the necessary unit and integration tests
• added a changelog entry to CHANGELOG.md
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• confirmed the correct type prefix in the PR title
• confirmed ! in the type prefix if API or client breaking change
• confirmed all author checklist items have been addressed
• reviewed state machine logic
• reviewed API design and naming
• reviewed documentation is accurate
• reviewed tests and test coverage
• manually tested (if applicable)

[codecov]

Codecov Report

Merging #831 (6089e0b) into master (c684768) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #831   +/-   ##
=======================================
  Coverage   81.53%   81.53%           
=======================================
  Files          89       89           
  Lines        7018     7018           
=======================================
  Hits         5722     5722           
  Misses       1035     1035           
  Partials      261      261           

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