Support reading proxy settings from config file

[stobrien89]

Origin: boto/botocore#2493

Is your feature request related to a problem? Please describe.
The FR is not related to a problem, but more so usability. It'd be nice to configure proxy settings from the Configuration file instead of modifying the Config object.

The proxies settings via environment variables will impact other services running.

Describe the solution you'd like
I'd like to be able to configure proxies from the configuration file, like ~/.aws/config.

[romank8k]

I would also like to see this implemented, for similar reasons to #538

[peteroneilljr]

This would be nice to move the copy the environment variable setting direct into the config file.

export HTTPS_PROXY=http://127.0.0.1:23456

into

[default]
AWS_ACCESS_KEY_ID=xxx
AWS_SECRET_ACCESS_KEY=xxx
CA_BUNDLE=/xx/xx/xx.pem
HTTPS_PROXY=http://127.0.0.1:23456

[debora-ito]

Reopening original issue boto/botocore#2493, please continue to track over there.

[github-actions]

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