CLOUDP-279533 Add support to load proxy settings from network settings

[fmenezes]

Proposed changes

Add support to load proxy settings from network settings

Jira ticket: CLOUDP-279533

Closes #[issue number]

Checklist

• I have signed the MongoDB CLA
• I have added tests that prove my fix is effective or that my feature works
• I have added any necessary documentation in document requirements section listed in CONTRIBUTING.md (if appropriate)
• I have addressed the @mongodb/docs-cloud-team comments (if appropriate)
• I have updated test/README.md (if an e2e test has been added)
• I have run make fmt and formatted my code

Further comments

this PR gets proxy settings from env on all OSes but on Windows and macOS it goes an extra mile to get settings from os see https://github.com/rapid7/go-get-proxied?tab=readme-ov-file#configuration for more info

[jeroenvervaeke]

Tested on:

• MacOS: Sonoma 14.7.1, working
• Ubuntu 22.04: was already working, but only when restarting the terminal after changing proxy settings (the default ubuntu terminal sets HTTP_PROXY and HTTPS_PROXY)