Proxy fixes

[Antiksec]

Describe the Pull Request

I made some proxy fixes because of two bugs:
- When running docker-compose setup because of mapping clean volume to "mobsf_data/tools" Jadx included in docker image will be deleted. download_file func uses system proxy instead of upstream_proxy func which causes not downloading Jadx during startup
- app func from google_play_scrapper lib doesn't support proxy + because of big timeout here https://github.com/JoMingyu/google-play-scraper/blob/ce1df6d67e6d8c39826daac2f668808fc025f284/google_play_scraper/utils/request.py#L11
if you behind proxy causes 15 minutes delay which looks like mobsf stucking when "fetching google play details" (https://github.com/MobSF/Mobile-Security-Framework-MobSF/issues/1974)

To be able to import uppstream_proxy into tools_download.py I had to move uppstream_proxy and other proxy functions into proxy.py because of a bug in cyclic import and import of django models when it was in utils.py

Checklist for PR

• Run MobSF unit tests and lint tox -e lint,test
• Tested Working on Linux, Mac, Windows, and Docker
• Add unit test for any new Web API (Refer: StaticAnalyzer/tests.py)
• Make sure tests are passing on your PR

Additional Comments (if any)

DESCRIBE HERE