[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

This PR adds a new fetch_data() capability to the DataConnect Python SDK, wiring a new service action through the Arrow Flight transport, service layer, and public client API.

Changes:

• Add a new Arrow Flight action mapping for "data.fetch_ticket".
• Add fetch_data() to the service interface and implement it in the default service.
• Expose fetch_data() on DataConnectClient and add a mapper intended to return pandas DataFrames.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 10 comments.

Show a summary per file

File	Description
dataconnect/transport/arrow_flight/transport.py	Adds Arrow Flight action mapping for the new data fetch action.
dataconnect/service/mappers.py	Introduces a new mapper intended to convert a ResourceInfo into a pandas DataFrame.
dataconnect/service/default.py	Implements fetch_data() by issuing a ResourceQuery and mapping results.
dataconnect/service/base.py	Extends the DataConnectService interface with fetch_data().
dataconnect/client.py	Adds a fetch_data() method to the public client API.

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