[WIP] add gateway dns request context categories selector doc

[rexscaria]

Summary

Doc for new request context categories in gateway DNS

• The documentation style guide has been adhered to.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• Files which have changed name or location have been allocated redirects.

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PR Change Summary

Added documentation for new request context categories in gateway DNS, including dynamic category blocking and selector usage.

• Introduced documentation for blocking dynamic lists of categories in gateway DNS requests.
• Added new selector for matching request context categories in the EDNS section.
• Provided examples for API and Terraform configurations related to the new categories.

Modified Files

• src/content/docs/cloudflare-one/policies/gateway/dns-policies/common-policies.mdx

Added Files

• src/content/partials/cloudflare-one/gateway/policies/dash-plus-api/dns/block-dynamic-categories.mdx
• src/content/partials/cloudflare-one/gateway/selectors/dns-request-context-categories.mdx

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