fixes #1943 - add data_source_rulesets

[helloandre]

adds support for data "cloudflare_rulesets"

example:

data "cloudflare_rulesets" "cmr" {
  zone_id = var.zone_id

  filter {
    name = "Cloudflare Managed Ruleset"
  }
}

[github-actions]

changelog detected ✅

[jacobbednarz]

thanks for this @helloandre 🙇 couple of things we need to do in order to get this one over the line:

• run make docs to generate the automatic registry documentation. see the docs for how to add examples of your intended usage.
• add some tests. if you're after prior art, check out https://github.com/cloudflare/terraform-provider-cloudflare/blob/master/internal/sdkv2provider/data_source_access_identity_provider_test.go which covers a few scenarios and will help us ensure we don't regress if we ever need to change the functionality here.

there are a couple of questions inline that hopefully make sense but if they don't, let me know and i'll elaborate on them some more 😄

[jacobbednarz]

acceptance tests all looking good!

TF_ACC=1 go test ./internal/sdkv2provider -v -run "^TestAccCloudflareRulesetsProviderDataSource_" -count 1 -parallel 1 -timeout 120m -parallel 1
=== RUN   TestAccCloudflareRulesetsProviderDataSource_PreventZoneIdAndAccountIdConflicts
--- PASS: TestAccCloudflareRulesetsProviderDataSource_PreventZoneIdAndAccountIdConflicts (2.29s)
=== RUN   TestAccCloudflareRulesetsProviderDataSource_RequireOneOfZoneAccountID
--- PASS: TestAccCloudflareRulesetsProviderDataSource_RequireOneOfZoneAccountID (1.81s)
=== RUN   TestAccCloudflareRulesetsProviderDataSource_FetchOWASPRulesetByName
--- PASS: TestAccCloudflareRulesetsProviderDataSource_FetchOWASPRulesetByName (8.63s)
=== RUN   TestAccCloudflareRulesetsProviderDataSource_FetchOWASPRulesetByID
--- PASS: TestAccCloudflareRulesetsProviderDataSource_FetchOWASPRulesetByID (8.35s)
PASS
ok  	github.com/cloudflare/terraform-provider-cloudflare/internal/sdkv2provider	21.702s

[github-actions]

This functionality has been released in v3.35.0 of the Terraform Cloudflare Provider.

Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!