[FEATURE] issue-44: Add support for file_encoding in sources

[ChillarAnand]

Description

Allow users to define custom encoding for files.

Changes Made

Add file_encoding support in sources.

Definition of Done

Before submitting this pull request, please ensure that the following criteria have been met:

• All automated tests have passed successfully.
• All manual tests have passed successfully.
• Code has been reviewed by at least one other team member.
• Code has been properly documented and commented as needed.
• All new and existing code adheres to our project's coding standards.
• All dependencies have been added or removed from the project's README or other documentation as needed.
• Any relevant documentation or help files have been updated to reflect the changes made in this pull request.
• Any necessary database migrations have been run.
• Any relevant UI changes have been reviewed and approved by the UI/UX team.

Additional Notes

closes #44

[shpiyu]

Thanks for your contribution Anand. I tried running the code in my local but ran into an error. It'd be great if you could fix those.

[ChillarAnand]

Thanks for your contribution Anand. I tried running the code in my local but ran into an error. It'd be great if you could fix those.

Thanks, @shpiyu

I have updated the code to resolve the issues.

[swarnadhakad]

LGTM, @shpiyu Pls review and test.

[shpiyu]

@ChillarAnand I was thinking to remove this default setting here and add defaults in pd.read_csv calls in file_reader and xml_reader. Like encoding=src.get('file_encoding', 'utf-8'). The benefit is, if we set default closer to where it is being used it'd be easier for the reader to understand that utf-8 is the default encoding. Let me know your thoughts?