feat: skip online DDL rewrite if it’s new table

[tianzhou]

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[Copilot]

Pull Request Overview

This PR skips online DDL rewrites for indexes and constraints when they are being created on newly created tables, optimizing the database migration process by avoiding unnecessary concurrent operations.

• Skip online DDL rewrite for indexes on new tables
• Skip online DDL rewrite for constraints on new tables
• Track newly created tables to identify when rewrites can be skipped

Reviewed Changes

Copilot reviewed 18 out of 18 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
testdata/diff/migrate/v5/plan.txt	Updated expected output to use regular CREATE INDEX instead of CREATE INDEX CONCURRENTLY
testdata/diff/migrate/v5/plan.sql	Updated SQL plan to use regular CREATE INDEX without concurrent operations
testdata/diff/migrate/v5/plan.json	Updated JSON plan structure to consolidate steps and remove wait directives
testdata/diff/migrate/v3/plan.txt	Updated expected output to use regular CREATE INDEX instead of CREATE INDEX CONCURRENTLY
testdata/diff/migrate/v3/plan.sql	Updated SQL plan to use regular CREATE INDEX without concurrent operations
testdata/diff/migrate/v3/plan.json	Updated JSON plan structure and version to consolidate steps
testdata/diff/create_table/add_table_no_online_rewrite/plan.txt	New test file for validating no online rewrite behavior
testdata/diff/create_table/add_table_no_online_rewrite/plan.sql	New test SQL plan for table creation without online operations
testdata/diff/create_table/add_table_no_online_rewrite/plan.json	New test JSON plan structure for table creation
testdata/diff/create_table/add_table_no_online_rewrite/old.sql	New test baseline with empty schema
testdata/diff/create_table/add_table_no_online_rewrite/new.sql	New test target schema with tables and indexes
testdata/diff/create_table/add_table_no_online_rewrite/diff.sql	New test diff file (empty)
testdata/diff/create_table/add_table_like/plan.txt	Updated expected output to use regular CREATE INDEX
testdata/diff/create_table/add_table_like/plan.sql	Updated SQL plan to use regular CREATE INDEX
testdata/diff/create_table/add_table_like/plan.json	Updated JSON plan structure and version
internal/plan/rewrite.go	Added logic to skip rewrites for indexes and constraints on newly created tables
internal/plan/plan.go	Added tracking of newly created tables in groupDiffs function
internal/ir/parser.go	Enhanced constraint name generation and column name extraction from CHECK expressions

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