Add ability to propagate RetrySettings

[vgvoleg]

No description provided.

[Copilot]

Pull request overview

This PR adds the ability to propagate YDB RetrySettings through SQLAlchemy connections, enabling users to customize retry behavior for database operations. This extends the existing pattern used for ydb_request_settings to also support ydb_retry_settings.

• Implements YdbRetrySettingsCharacteristic following the same pattern as YdbRequestSettingsCharacteristic
• Adds getter/setter/reset methods for retry settings in both the dialect and adapter layers
• Updates the minimum ydb-dbapi version requirement to 0.1.16 to support the new retry settings functionality

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated no comments.

File	Description
ydb_sqlalchemy/sqlalchemy/dbapi_adapter.py	Adds set_ydb_retry_settings and get_ydb_retry_settings methods to the adapted connection class
ydb_sqlalchemy/sqlalchemy/init.py	Implements YdbRetrySettingsCharacteristic class, adds corresponding dialect methods, and registers the characteristic in the connection characteristics dictionary
requirements.txt	Updates minimum ydb-dbapi version from 0.1.10 to 0.1.16

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