Add a cargo deny workflow (#89)

* Add a cargo deny workflow

Also trims out a pointless submodule checkout (we have none).

* Remove no longer relevant advisories/allowances

* Patch for array-bytes

* Remove unused properties

* Restore chrono advisory

* Allow MPL-2.0, correct GPL-3.0 allowance specification

* Properly ban copyleft, run on all crates

* Exceptions for Serai crates (AGPL-3.0)

* Remove top comments

* Clarify reasoning for not checking advisories in CI

* Run all checks in CI

While this may bring down an unrelated commit, we can manually review, before creating a followup commit allowing it. If it's critical, then this did its job.

.github/workflows/monero-tests.yaml

@@ -17,8 +17,6 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
-        with:
-          submodules: "recursive"
 
       - name: Test Dependencies
         uses: ./.github/actions/test-dependencies
@@ -37,8 +35,6 @@ jobs:
 
     steps:
       - uses: actions/checkout@v3
-        with:
-          submodules: "recursive"
 
       - name: Test Dependencies
         uses: ./.github/actions/test-dependencies