SNOW-1346341: Consideration of PROXY*/NO_PROXY env variables in creation httpAgent.

[sfc-gh-ext-simba-jy]

Description

Please explain the changes you made here.

• [x] Implemented PROXY NO PROXY env variables
• [X] Added proxy:false option in axios option(This should be off. If not, there will be two proxy configuration. One in axios and another one in HTTPS_PROXY_Agent)
• [x] In snowflake Config, added an option called "proxy", which users can enable or disable the proxy from the environment variables.

Checklist

• [ ] Format code according to the existing code style (run npm run lint:check -- CHANGED_FILES and fix problems in changed code)
• [ ] Create tests which fail without the change (if possible)
• [ ] Make all tests (unit and integration) pass (npm run test:unit and npm run test:integration)
• [ ] Extend the README / documentation and ensure is properly displayed (if necessary)
• [ ] Provide JIRA issue id (if possible) or GitHub issue id in commit message

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 96.96970% with 2 lines in your changes missing coverage. Please review.

Project coverage is 89.00%. Comparing base (c77f3d6) to head (f26430e).

Files with missing lines	Patch %	Lines
lib/file_transfer_agent/s3_util.js	87.50%	1 Missing :warning:
lib/http/node.js	80.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #938 +/- ## ========================================== + Coverage 88.94% 89.00% +0.05% ========================================== Files 67 67 Lines 6459 6510 +51 ========================================== + Hits 5745 5794 +49 - Misses 714 716 +2 ```

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