docs: add Skip List report for v3.3.0

[tkykenmt]

Summary

This PR adds documentation for the Skip List feature enhancements in OpenSearch v3.3.0.

Changes

Release Report (docs/releases/v3.3.0/features/opensearch/skip-list.md):

• Date histogram aggregation optimization using DocValuesSkipper
• Extended field type support (date, date_nanos, scaled_float, token_count)
• Sub-aggregation support for histogram aggregations
• Automatic enablement for @timestamp and index sort fields

Feature Report (docs/features/opensearch/skip-list.md):

• Renamed from numeric-field-skip-list.md to reflect broader scope
• Updated architecture diagrams
• Added v3.3.0 components and configuration
• Updated supported field types table
• Added new usage examples for date histogram aggregations
• Updated change history

Related PRs

• #19130: Adding logic for histogram aggregation using skiplist
• #19142: Add skip_list param for date, scaled float and token count fields
• #19438: Add sub aggregation support for histogram aggregation using skiplist
• #19480: Enable skip_list for @timestamp field or index sort field by default

Closes #1403