Add offline Python dependency installation instructions for plugin (#985)

[uvv-01]

This PR addresses issue #985: Unable to use plugin offline due to missing dependencies.

Changes included:

• Added requirements.lock.txt with frozen dependencies.
• Added offline_install.md with instructions for offline installation.
• Downloaded required wheels (numpy, openvino-telemetry) into offline_packages/ folder.

These changes allow users to install the plugin and its dependencies on a machine without internet access.

Steps to test:

1. Clone the repository.
2. Follow instructions in offline_install.md to install dependencies offline.
3. Verify that the plugin works without internet connection.

Linked issue: #985

[uvv-01]

@ngaloppo @abrown @alvoron @keyur2maru ,
sir can you please approve the workflow.

[uvv-01]

.check

[uvv-01]

Note

sir could you please and pass the checks @ngaloppo @abrown @alvoron @keyur2maru