Version 7.0: Upgrade to anydataset-db 7.0

[byjg]

Overview

Upgrades the library to byjg/anydataset-db 7.0 and bumps the migration version to 7.0, aligning it with the anydataset-db major version.

Changes

• Replace the driver query methods removed in anydataset-db 7.0 (execute, getScalar, getIterator) with the new DatabaseExecutor API
• Add getExecutor(): DatabaseExecutor to Migration, DatabaseInterface, and AbstractDatabase
• Rename the protected static helper getDbDriverWithoutDatabase() to getExecutorWithoutDatabase() (now returns DatabaseExecutor)
• Change PgsqlDatabase::createDatabaseIfNotExists() to receive a DatabaseExecutor
• Upgrade PHPUnit to ^12.5
• Pin SQL Server image to 2022-latest and use MSSQL_SA_PASSWORD in docker-compose
• Add CHANGELOG-6.0.md (released 6.0) and CHANGELOG-7.0.md with the full upgrade path
• Document getExecutor() in the API reference

Breaking Changes

• Consumers calling query methods on $migration->getDbDriver() must switch to $migration->getExecutor() (transactions stay on the driver)
• Custom DatabaseInterface implementations must add getExecutor() (inherited when extending AbstractDatabase)

See CHANGELOG-7.0.md for the detailed upgrade path.

Testing

• Psalm: no errors
• PHPUnit: 111 tests, 704 assertions passing against MySQL, PostgreSQL, SQLite, and SQL Server (dblib); sqlsrv tests skipped locally (extension not installed)