Improve typing of `django.db.backends.mysql.base.DatabaseWrapper` attributes

[JaeHyuckSa]

I have made things!

I modified the Any value of the django.db.backends.mysql.base.DatabaseWrapper's arguments .

• [x] django.db.backends.mysql.base.DatabaseWrapper.data_types
• [x] django.db.backends.mysql.base.DatabaseWrapper.operators
• [x] django.db.backends.mysql.base.DatabaseWrapper.pattern_ops
• [x] django.db.backends.mysql.base.DatabaseWrapper.isolation_levels
• [x] django.db.backends.mysql.base.DatabaseWrapper.SchemaEditorClass
• [x] django.db.backends.mysql.base.DatabaseWrapper.isolation_level
• [x] django.db.backends.mysql.base.DatabaseWrapper.needs_rollback

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