Add tag parameter support in place_gtt() for Python client

[viral4u]

Description:
Placing regular orders supports the tag parameter, but the place_gtt() method in the Python client (kiteconnect v5.0.1) does not expose it.

Impact:
Without tag, users cannot directly trace GTT-triggered orders/trades to strategies. This forces maintaining external mapping.

Proposal:
Extend place_gtt() to include an optional tag parameter and forward it to the API request. Once GTT order is released, same tag should carry forward to the order.

Reference:
Python client source: kiteconnect/connect.py, method place_gtt.

[Shiv-Expert2503]

Hi @viral4u ,

I've created a pull request that should resolve this issue. With tag parameter support for place_gtt() and modify_gtt() methods. Includes tests and examples.

The full details are in the PR for review: #208
Let me know what you think!