Make runtime dependency on pkg_resources explicit

[peter-malcolm-bw]

We're trying to use the tap in a uv managed virtual environment and the tap is failing to run due to an import error.

I can reproduce the error with the following command:

uvx tap-bing-ads

Produces the following error:

Traceback (most recent call last):
  File "~/Library/Caches/uv/archive-v0/-8L4x22tSjG22uG3pghnO/bin/tap-bing-ads", line 7, in <module>
    from tap_bing_ads import main
  File "~/Library/Caches/uv/archive-v0/-8L4x22tSjG22uG3pghnO/lib/python3.11/site-packages/tap_bing_ads/__init__.py", line 18, in <module>
    import bingads
  File "~/Library/Caches/uv/archive-v0/-8L4x22tSjG22uG3pghnO/lib/python3.11/site-packages/bingads/__init__.py", line 3, in <module>
    from .service_client import *
  File "~/Library/Caches/uv/archive-v0/-8L4x22tSjG22uG3pghnO/lib/python3.11/site-packages/bingads/service_client.py", line 5, in <module>
    from .service_info import SERVICE_INFO_DICT
  File "~/Library/Caches/uv/archive-v0/-8L4x22tSjG22uG3pghnO/lib/python3.11/site-packages/bingads/service_info.py", line 1, in <module>
    import pkg_resources
ModuleNotFoundError: No module named 'pkg_resources'

This issue is covered in more detail here: https://www.cosmoscalibur.com/en/blog/2025/modulo-pkg-resources-no-encontrado-en-ambientes-uv/

I believe it could be resolved by editing setup.py to make pkg_resources an explicit runtime dependency.

[peter-malcolm-bw]

I think this also becomes a breaking change for upgrading to python3.12 where setuptools has become optional see python/cpython#101039:

Steps to reproduce:

python3.12 -m venv venv
source venv/bin/activate
pip install tap-bing-ads
tap-bing-ads --help