http: add http.setGlobalProxyFromEnv()

[joyeecheung]

This adds an API to dynamically enable built-in proxy support for all of fetch() and http.request()/https.request(), so that users do not have to be aware of them all and configure them one by one.

[nodejs-github-bot]

Review requested:

• [ ] @nodejs/crypto
• [ ] @nodejs/http
• [ ] @nodejs/net

[codecov[bot]]

Codecov Report

:x: Patch coverage is 93.18182% with 6 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 88.51%. Comparing base (644fb88) to head (ae24120). :warning: Report is 49 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/http.js	95.00%	3 Missing :warning:
lib/internal/http.js	87.50%	2 Missing and 1 partial :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #60953      +/-   ##
==========================================
- Coverage   88.51%   88.51%   -0.01%     
==========================================
  Files         703      703              
  Lines      208394   208500     +106     
  Branches    40193    40212      +19     
==========================================
+ Hits       184470   184560      +90     
- Misses      15934    15958      +24     
+ Partials     7990     7982       -8     

Files with missing lines	Coverage Δ
lib/_http_agent.js	97.30% <100.00%> (-0.02%)	:arrow_down:
lib/https.js	98.22% <100.00%> (-0.02%)	:arrow_down:
lib/http.js	98.83% <95.00%> (-1.17%)	:arrow_down:
lib/internal/http.js	92.11% <87.50%> (-3.66%)	:arrow_down:

... and 55 files with indirect coverage changes

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[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/70399/

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/70427/

[github-actions[bot]]

The https://github.com/nodejs/node/labels/notable-change label has been added by @joyeecheung.

Please suggest a text for the release notes if you'd like to include a more detailed summary, then proceed to update the PR description with the text or a link to the notable change suggested text comment. Otherwise, the commit will be placed in the Other Notable Changes section.

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/70430/

[nodejs-github-bot]

Landed in c0108bfc55032d06ed0e9fe2802b437603b80a7d