docs: add doc-request report for v3.3.0

[tkykenmt]

Summary

Adds documentation for the DocRequest resource type support feature in v3.3.0.

Changes

• Release report: docs/releases/v3.3.0/features/anomaly-detection/doc-request.md
  • Documents the new type() method added to DocRequest interface
  • Covers Anomaly Detection plugin integration with resource types
• Feature report update: docs/features/opensearch/docrequest-refactoring.md
  • Added v3.3.0 PRs to Related PRs table
  • Updated Change History with v3.3.0 changes

Key Changes in v3.3.0

• OpenSearch core adds type() method to DocRequest interface (default: "indices")
• Anomaly Detection plugin implements resource types for detectors and forecasters
• Enables Security plugin's resource sharing framework to authorize access by resource type

Related PRs

• Add new extensible method to DocRequest to specify type opensearch-project/OpenSearch#19313: Add new extensible method to DocRequest to specify type
• Adds resource types to DocRequests opensearch-project/anomaly-detection#1566: Adds resource types to DocRequests

Closes #1382