add doc on handling categories and app types in gateway via terraform

[rexscaria]

Summary

This adds useful info on how to use category and app type data source in terraform.

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PR Change Summary

Added documentation on using app types and categories in Terraform for the Gateway.

• Introduced a section on how to use app types in Terraform with example code.
• Added guidance on using categories in Terraform with example code.

Modified Files

• src/content/docs/cloudflare-one/policies/gateway/application-app-types.mdx
• src/content/docs/cloudflare-one/policies/gateway/domain-categories.mdx

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