YDB database support

[asmyasnikov]

Added YDB support to golang-migrate

This PR implements support for YDB in golang-migrate. The main changes include:

• Added the YDB driver
• Implemented necessary functions for migrations, including Open, Close, Lock, Unlock, Run, SetVersion, Version, and Drop.
• Added tests for the YDB driver in ydb_test.go, including common SQL instructions (such as CREATE/ALTER/DROP TABLE) and YDB-specific instructions (such as CREATE/DROP TOPIC - YDB message bus)
• Updated the documentation in README.md to include instructions on how to use the YDB driver.

How to Test:

1. Set up an YDB environment.
2. Run the unit and integration tests to ensure all functionalities are working correctly.
3. Follow the instructions in the documentation to test real migrations using the YDB driver.

[coveralls]

coverage: 56.532% (+0.2%) from 56.314%
when pulling 001b2f0 on ydb-platform:master
into 2788339 on golang-migrate:master.

[asmyasnikov]

@dhui Can you see this PR? We are waiting YDB support in golang-migrate very much

[Copilot]

Pull Request Overview

This PR adds support for YDB (Yandex Database) to golang-migrate, implementing a complete database driver with migration capabilities, locking mechanisms, and comprehensive test coverage.

Key Changes:

• New YDB database driver with full migration lifecycle support (Open, Close, Lock, Unlock, Run, SetVersion, Version, Drop)
• Extensive test suite including integration tests with Docker containers
• Complete documentation with connection string format and configuration options

Reviewed Changes

Copilot reviewed 19 out of 20 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
internal/cli/build_ydb.go	Build tag configuration to conditionally include YDB driver in CLI builds
go.mod / go.sum	Added YDB SDK dependencies (v3.100.0) and related transitive dependencies
database/ydb/ydb.go	Main driver implementation with connection handling, migrations, versioning, and locking
database/ydb/ydb_test.go	Comprehensive test suite with Docker-based integration tests for multiple YDB versions
database/ydb/examples/migrations/*.sql	Example migrations demonstrating YDB-specific features (tables, columns, indexes, topics)
database/ydb/README.md	Detailed documentation covering connection strings, authentication methods, TLS options, and troubleshooting
README.md	Added YDB to the list of supported database drivers
Makefile	Added ydb to the DATABASE variable for build/test targets

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