refactor rulesets into separate files and add a ruleset compiler cli …

[deoxykev]

This PR does the following:

1. Break out the monolithic ruleset.yaml into an organized directory of smaller rulesets.

   rulesets
   ├── ca
   │  └── _multi-metroland-media-group.yaml
   ├── ch
   │  └── nzz-ch.yaml
   ├── de
   │  └── tagesspiegel-de.yaml
   ├── gb
   │  └── ft-com.yaml
   └── us
   ├── _multi-conde-nast.yaml
   ├── americanbanker-com.yaml
   ├── medium-com.yaml
   ├── nytimes-com.yaml
   ├── usatoday-com.yaml
   └── washingtonpost-com.yaml

Create a CLI option --merge-ruleset and --merge-ruleset-gzip that optionally merges the rulesets into a single file for release.

---

I'm not familiar enough with Github CI/CD and goreleaser to make changes with the releaser, but ideally the ruleset.yaml should be distributed with the release files.

Something like this in .github/workflows/release-binaries.yaml

        name: Build rulesets for release
        run: |
          go run cmd/main.go --ruleset "./rulesets" --merge-rulesets --merge-rulesets-output "ruleset.yaml"

[mms-gianni]

My first intention was to create a bash script. But this is way better.

1. It ships with the app.
2. it aligns automatically with the app.
3. It is typesafe

Writing an action to install the binary and generate the rules is a challenge. But I think I can handle that.