fix: constraint name quoting

[tianzhou]

Further fix #78

[Copilot]

Pull Request Overview

This PR enhances constraint name quoting to properly handle identifiers that require quotes according to PostgreSQL rules, specifically addressing constraint names containing whitespace as mentioned in GitHub issue #78.

• Systematically wraps all constraint name references with ir.QuoteIdentifier() across the codebase
• Adds test case with a constraint named "price not negative" to verify proper quoting of names with spaces
• Updates test function name and test data directory to reflect the expanded scope

Reviewed Changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
testdata/dump/issue_78_constraint_not_valid_and_quoting/raw.sql	Adds test constraint with whitespace in name to verify proper quoting
testdata/dump/issue_78_constraint_not_valid_and_quoting/pgschema.sql	Expected pgschema output showing properly quoted constraint name
testdata/dump/issue_78_constraint_not_valid_and_quoting/pgdump.sql	Expected pgdump output showing properly quoted constraint name
testdata/dump/issue_78_constraint_not_valid_and_quoting/manifest.json	Test manifest documenting the constraint name quoting test case
testdata/dump/issue_78_constraint_not_valid/manifest.json	Removed old manifest (test case consolidated)
internal/plan/rewrite.go	Wraps constraint names with ir.QuoteIdentifier() in rewrite operations
internal/diff/type.go	Wraps constraint names with ir.QuoteIdentifier() in domain type ALTER statements
internal/diff/trigger.go	Wraps trigger names with ir.QuoteIdentifier() for constraint triggers
internal/diff/table.go	Wraps constraint names with ir.QuoteIdentifier() throughout table ALTER statements
internal/diff/constraint.go	Wraps constraint names with ir.QuoteIdentifier() in constraint SQL generation
cmd/dump/dump_integration_test.go	Renames test function to reflect expanded scope including quoting tests

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