Fix/tcolor preserve metadata

[aviralgarg05]

This Pull request:

Changes or fixes:

• Add import functools to enable metadata preservation
• Decorate wrapper function with @functools.wraps(original_init) to maintain name, doc, and wrapped attributes
• Fixes TColor.DefinedColors(1) failure in Jupyter notebooks
• Ensures proper method resolution in introspection-heavy environments

Checklist:

• tested changes locally
• updated the docs (if necessary)

This PR fixes #20018

[github-actions]

Test Results

    22 files      22 suites   3d 20h 32m 52s ⏱️
 3 692 tests  3 673 ✅  1 💤 18 ❌
79 286 runs  79 119 ✅ 93 💤 74 ❌

For more details on these failures, see this check.

Results for commit c72f0e0.

♻️ This comment has been updated with latest results.

[dpiparo]

Thanks for this code. In order to start the review we would need to also have a test that reproduces the problem. Notebook tests are in this directory https://github.com/root-project/root/tree/master/roottest/python/JupyROOT