Provide a common atomic Rate Limiter implementation (#560)

* Provide a common atomic Rate Limiter implementation

Signed-off-by: Bob Weinand <bob.weinand@datadoghq.com>

* Use proper high resolution monotonic timer on windows

* Add minimal sleep for test stability

* Disable shellcheck warning

Signed-off-by: Bob Weinand <bob.weinand@datadoghq.com>

* Fix aftrer rebase

* Validate rate() in test

Signed-off-by: Bob Weinand <bob.weinand@datadoghq.com>

* Validate limit change in test

Signed-off-by: Bob Weinand <bob.weinand@datadoghq.com>

* Work around floating point precision issues

Signed-off-by: Bob Weinand <bob.weinand@datadoghq.com>

* Update rate_limiter.rs

---------

Signed-off-by: Bob Weinand <bob.weinand@datadoghq.com>

.github/workflows/lint.yml

@@ -44,7 +44,9 @@ jobs:
  run: rustup install ${{ matrix.rust_version }} && rustup default ${{ matrix.rust_version }} && rustup component add clippy
  - name: Run clippy on ${{ matrix.platform }} ${{ matrix.rust_version }} 
  shell: bash
- run: cargo clippy --all-targets --all-features -- -D warnings "$([ ${{ matrix.rust_version }} = 1.71.1 ] && echo -Aunknown-lints)"
+ run: |
+ # shellcheck disable=SC2046
+ cargo clippy --all-targets --all-features -- -D warnings $([ ${{ matrix.rust_version }} = 1.71.1 ] && echo -Aunknown-lints -Aclippy::cast_ref_to_mut)
  licensecheck:
  runs-on: ubuntu-latest
  name: "Presence of licence headers"