feat: materialized_view_index

[tianzhou]

Fix #66

[Copilot]

Pull Request Overview

This PR adds support for materialized view indexes to pgschema, addressing issue #66. The implementation enables creating, modifying, and dropping indexes on materialized views with both offline and online migration strategies.

Key changes:

• Extended the View struct to include an Indexes field for materialized views
• Added index support throughout the parser, differ, and plan generation pipeline
• Implemented proper categorization and handling of view index operations in migration plans

Reviewed Changes

Copilot reviewed 35 out of 35 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
testdata/dump/sakila/pgschema.sql	Added sample materialized view index creation
testdata/diff/online/alter_materialized_view_index/*	Test data for online index modification scenarios
testdata/diff/online/add_materialized_view_index/*	Test data for adding indexes to materialized views
testdata/diff/create_materialized_view/alter_materialized_view/*	Updated test to reflect new plan output format
testdata/diff/create_index/drop_index/*	Extended test to include view index operations
testdata/diff/comment_on/add_index_comment/*	Added materialized view index comment scenarios
ir/parser.go	Enhanced parser to handle indexes on materialized views
ir/ir.go	Added Indexes field to View struct for materialized views
ir/inspector.go	Modified index building to support materialized views
internal/plan/rewrite.go	Added view index rewrite support for online operations
internal/plan/plan.go	Enhanced plan generation to handle view operations and sub-resources
internal/diff/view.go	Implemented view index diffing and SQL generation
internal/diff/index.go	Refactored index creation to support both tables and views
internal/diff/diff.go	Added new diff types for view indexes and enhanced view diffing

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