Add proxy option for CLI

[MonkeyCanCode]

This feature is requested from #1113. Currently we don't support pass in proxy info.

Here is how this PR is being validated:
Terminal 1:

# Setup mitmproxy
(venv) yong@DESKTOP:~/k8s/polaris(main)$ pip install mitmproxy
# Start mitmproxy
(venv) yong@DESKTOP:~/k8s/polaris(proxy_support)$ mitmproxy

Terminal 2:

# Start polaris service
yong@DESKTOP:~/k8s/polaris(main)$ ./gradlew run

Terminal 3:

# List catalog without proxy
yong@DESKTOP:~/k8s/polaris(proxy_support)$ ./polaris --profile dev catalogs list
yong@DESKTOP:~/k8s/polaris(proxy_support)$ echo $?
0
# List catalog with proxy
yong@DESKTOP:~/k8s/polaris(proxy_support)$ ./polaris --profile dev --proxy http://localhost:8080 catalogs list
yong@DESKTOP:~/k8s/polaris(proxy_support)$ echo $?
0

Now here is the output from terminal 1: