Limit tables of datasourse in context of the mind

[ea-rus]

Implements API added in https://github.com/mindsdb/mindsdb_gateway/pull/974

It allows to limit tables of datasource used by mind only in context of the mind. It is done without modifying datasource.

Usage:

from minds.datasources.datasources import DatabaseTables
datasource = DatabaseTables(
    name='my_db',                 # use existed datasource name
    tables=['table1', 'table1'],  # add limitation for used tables
)
mind4 = client.minds.create(name='mind_name', datasources=[datasource])

Fixes: https://linear.app/mindsdb/issue/BE-610/create-mind-use-list-of-tables-for-datasource

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Pull request summary

• Added a new DatabaseTables class to define data sources with specific table restrictions.
• Updated the README.md to include examples of creating minds with table-restricted data sources.
• Modified the examples/base_usage.py to demonstrate the use of the new DatabaseTables class.
• Refactored the datasources.py file to introduce a base class DatabaseConfigBase for better structure.
• Enhanced the _check_datasource method to return a dictionary containing both the name and tables of the data source.
• Updated the create and update methods in minds.py to handle the new data source structure.
• Adjusted integration tests in test_base_flow.py to validate the functionality of minds with table-restricted data sources.
• Modified unit tests in test_unit.py to ensure proper handling of the new data source format.
• Ensured backward compatibility by maintaining existing functionality while introducing new features.
• Improved code readability and maintainability through consistent naming conventions and structured class definitions.