Add python environment setup script

[yunowo]

Description

Setup environment variables needed for python bindings for current powershell session.
After setup, you can use gvapython via gst-launch-1.0 or launch pipeline via python script.

Fixes # (issue)

Any Newly Introduced Dependencies

Please describe any newly introduced 3rd party dependencies in this change. List their name, license information and how they are used in the project.

How Has This Been Tested?

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Checklist:

• I agree to use the MIT license for my code changes.
• I have not introduced any 3rd party components incompatible with MIT.
• I have not included any company confidential information, trade secret, password or security token.
• I have performed a self-review of my code.

[Copilot]

Pull request overview

Adds a PowerShell helper to configure the current Windows PowerShell session for DL Streamer’s Python bindings, and updates Python dependency selection to support Windows via gstreamer-python.

Changes:

• Add scripts/setup_python_env.ps1 to validate Python/GStreamer availability and set env vars for Python bindings in the current session.
• Update requirements.txt to use gstreamer-python on Windows and PyGObject on non-Windows platforms.

Reviewed changes

Copilot reviewed 1 out of 2 changed files in this pull request and generated 3 comments.

File	Description
scripts/setup_python_env.ps1	New PowerShell script that checks prerequisites and sets PYTHONPATH / GI-related env vars for Python bindings.
requirements.txt	Adds platform markers to install gstreamer-python on Windows and PyGObject elsewhere.

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