Merge branch 'ps/ci-rust' into dk/ci-rust-fix

* ps/ci-rust:
  rust: support for Windows
  ci: verify minimum supported Rust version
  ci: check for common Rust mistakes via Clippy
  rust/varint: add safety comments
  ci: check formatting of our Rust code
  ci: deduplicate calls to `apt-get update`
  t8020: fix test failure due to indeterministic tag sorting
  gitlab-ci: upload Meson test logs as JUnit reports
  gitlab-ci: drop workaround for Python certificate store on Windows
  gitlab-ci: ignore failures to disable realtime monitoring
  gitlab-ci: dedup instructions to disable realtime monitoring
  ci: enable Rust for breaking-changes jobs
  ci: convert "pedantic" job into full build with breaking changes
  BreakingChanges: announce Rust becoming mandatory
  varint: reimplement as test balloon for Rust
  varint: use explicit width for integers
  help: report on whether or not Rust is enabled
  Makefile: introduce infrastructure to build internal Rust library
  Makefile: reorder sources after includes
  meson: add infrastructure to build internal Rust library