refactor: Clean up unused code and merge creates DEV-4067

[seakayone]

• Remove unused code:
  -- All code related to file formats other than json
  -- Experimental rdf code which is not used in the server or cli
  -- Unused domain model code
• Merge crates and remove Cargo workspace
• Delete unused dependencies
• Update Cargo.lock
• Update release-please config and manifest

[linear]

DEV-4067 Clean up code and merge creates

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 63.5%. Comparing base (4d3820f) to head (70848d3).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/main-server.rs	0.0%	1 Missing ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
src/api/convert/axum/responses.rs	0.0% <ø> (ø)
src/api/handler/health.rs	100.0% <ø> (ø)
src/api/handler/robots_txt.rs	100.0% <ø> (ø)
src/api/handler/sitemap_xml.rs	100.0% <ø> (ø)
src/api/handler/v1/projects/handlers.rs	100.0% <ø> (ø)
src/api/handler/v1/projects/responses.rs	100.0% <ø> (ø)
src/api/router.rs	99.1% <100.0%> (ø)
src/cli.rs	0.0% <ø> (ø)
src/domain/metadata_repository.rs	90.1% <100.0%> (ø)
src/domain/metadata_service.rs	100.0% <ø> (ø)
... and 7 more

[BalduinLandolt]

Two small comments in the Cargo.toml file, other than that it looks good