Restructure of Madmigration implementation Workflow

[maestro-1]

• This PR serves to improve the workflow, allowing for ease of extending support and functionality hence covering Oracle connection #80, achieved by reworking the connection engine and how it interacts with the controller
• Rework the integration with the Migration Controller to allow for flexibility, hence dealing with interaction between different database types postgresql to mongoDB #62 and postgresql -> MongoDB indexing columns #64 . Hence extendible to cover the likes of CassandraDB and redis in future versions. The context manager of the MigrationController class ensures for a graceful exit Handleing Exception #35
• Added connection for async engine via sqlalchemy's new 1.4> version, fix issue async driver support for migration data and create schemas #43
• Removal of sqlalchemy-utils. Incompatible with new versions(async) of sqlalchemy. Uses around the code base is few and limiting. Custom functions written to allow for extending beyond MongoDB and SQL based databases

[Turall]

Hi @maestro-1 , thank you for your interest in our tool. I didn't test your changes, because I get an error when I run the code NameError: Field name "Config" shadows a BaseModel attribute; use a different field name with "alias='Config'". You use in SQLConfigSchema Config field which used internally in pydantic

Full trace:

  File "/Users/tural/opt/mad-migration/app.py", line 2, in <module>
    from madmigration.scripts.commands import cli
  File "/Users/tural/opt/mad-migration/madmigration/scripts/commands.py", line 2, in <module>
    from madmigration.config.conf import Config
  File "/Users/tural/opt/mad-migration/madmigration/config/conf.py", line 6, in <module>
    from madmigration.config.config_schema import SQLConfigSchema, NoSQLConfigSchema
  File "/Users/tural/opt/mad-migration/madmigration/config/config_schema.py", line 75, in <module>
    class SQLConfigSchema(BaseModel):
  File "/Users/tural/opt/mad-migration/.venv/lib/python3.9/site-packages/pydantic/main.py", line 244, in __new__
    validate_field_name(bases, ann_name)
  File "/Users/tural/opt/mad-migration/.venv/lib/python3.9/site-packages/pydantic/utils.py", line 99, in validate_field_name
    raise NameError(
NameError: Field name "Config" shadows a BaseModel attribute; use a different field name with "alias='Config'"```