[MCC-1476014] Python Lib-Create Fetch_data() function

[afieraru-mdsol]

feature/bug/enhance/refactor/tech_debt/hotfix

• Python Lib-Create Fetch_data() function
• MCC-1476014

Checklist

• Review the pull request to fix typos and ensure variable/function names are intuitive, etc.
• Make sure the pull request does not have excessive number of unnecessary commits. Utilize the git commit --amend --no-edit command to reduce commit messages when making small file changes (like changing linespacing).
• Make sure you have added unit tests for the code changes. Tests should be added in the tests/ folder.
• Modify docs, if required. Add any new documentation in the doc/ folder.
• Rebase on latest active development branch (develop/main).

Changes Summary

• Create fetch_data() function

[Copilot]

Pull request overview

Adds a new fetch_data() implementation to the Python DataConnect client, aiming to fetch dataset data via Arrow Flight and return it in a more user-friendly format.

Changes:

• Added pandas as a Poetry dependency.
• Updated fetch_data() to return a pandas.DataFrame and added a _get_dataset() helper to stream record batches.
• Consolidated exception imports in the PyArrow transport module.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 5 comments.

File	Description
pyproject.toml	Adds pandas to core dependencies to support returning DataFrames from the client.
dataconnect/framework/pyarrow_transport.py	Adjusts exception imports for the Flight transport implementation.
dataconnect/client.py	Reworks fetch_data() to produce a DataFrame and introduces _get_dataset() to stream/assemble results.

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