Investigate perf improvement by not importing "requests" when no HTTP use planned

[lmazuel]

For instance "import azure.core.exceptions" (CLI)

PS: Same apply for aiohttp if the env has it

This is issue is about requests is installed and we should not import it if not necessary.

[xiangyan99]

#25344

[github-actions]

Hi Laurent Mazuel (@lmazuel), we deeply appreciate your input into this project. Regrettably, this issue has remained inactive for over 2 years, leading us to the decision to close it. We've implemented this policy to maintain the relevance of our issue queue and facilitate easier navigation for new contributors. If you still believe this topic requires attention, please feel free to create a new issue, referencing this one. Thank you for your understanding and ongoing support.