Migrating MariaDB's existing database with a case insensitive environment and getting the error: Can't create database 'dbname'; database exists.

[najeraz]

Describe the bug
When migrating an existing database using a name with a different case, grate tries to re-create it when the MariaDB instance and the environment have enabled the case insensitive.

To Reproduce

• Run a MariaDB instance with the environment variable lower_case_table_names as 1 with:
  docker run --name GrateTestCaseInsensitive -p 49185:3306 -e MYSQL_ROOT_PASSWORD=mypass mariadb:10.5.9 mysqld --lower_case_table_names=1
• Create a database manually with a name using uppercase letters.
• Migrate it with the same name using a camel case.

Expected behavior
If the case name is insensitive, it should not try to create the existing database.

Desktop

• OS: Windows 11 Enterprise
• Version 21H2

[najeraz]

Added a PR #216