feat: reset login attempts for a user with "alter user login"

Summary

• feat: reset login attempts for a user with "alter user login"

We need another way to unlock users who exceeded max login attempts. Now in addition to restarting the instance this can be done with granting session to user (e.g alter user USER with login in sql)

• feat: make alter and revoke privilege operations idempotent

• test: enable test_sql_alter_login

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• Close #495 (closed)
• Target branch: master
• Docs follow-up: docs#172 (closed)
• See also #443 (closed)