Add check runtimes GH Workflow (#2252)

This PR introduces:
- a new script 
- a new GH Workflow 
- runtime reference spec files for `rococo` and `westend`

It brings a mechanism to check that part(s) of the runtimes' metadata
that should not change over time, actually did not change over time.

Ideally, the GHW should trigger when a release is edited but GH seem to
[have an issue](https://github.com/orgs/community/discussions/47794)
that prevents the trigger from working. This is why the check has been
implemented as `workflow_dispatch` for a start.

The `workflow_dispatch` requires a `release_id` that can be found using:
```
curl -s -H "Authorization: Bearer ${GITHUB_TOKEN}" \
   https://api.github.com/repos/paritytech/polkadot-sdk/releases | \
   jq '.[] | { name: .name, id: .id }'
```
as documented in the workflow.

A sample run can be seen
[here](https://github.com/chevdor/polkadot-sdk/actions/runs/6811176342).

.github/workflows/check-publish.yml

@@ -12,7 +12,7 @@ jobs:
   check-publish:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@8ade135a41bc03ea155e62e844d188df1ea18608 # v4.1.0
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
 
       - name: Rust Cache
         uses: Swatinem/rust-cache@3cf7f8cc28d1b4e7d01e3783be10a97d55d483c8 # v2.7.1