[DF-324] Add create_database_if_not_exists method

[LucasMMota]

Why? :open_book:

We don't have an option to create a database only if it doesn't exist in the Metastore Server. So this PR creates the create_database_if_not_exists method, simulating this behavior.

What? :wrench:

• add method create_database_if_not_exists and tests

Type of change :file_cabinet:

• [X] New feature (non-breaking change which adds functionality)
• [X] This change requires a documentation update

How everything was tested? :straight_ruler:

Unit tests + manual test with server

Checklist :memo:

• [X] I have added labels to distinguish the type of pull request.
• [X] My code follows the style guidelines of this project (docstrings, type hinting and linter compliance);
• [X] I have performed a self-review of my own code;
• [X] I have made corresponding changes to the documentation;
• [X] I have added tests that prove my fix is effective or that my feature works;
• [X] I have made sure that new and existing unit tests pass locally with my changes;

[sonarcloud[bot]]

Kudos, SonarCloud Quality Gate passed!

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