feat(dash): Add --insecure option

[robinjoseph08]

This adds the flag --insecure to asynq dash that works just like the --insecure flag on the redis-cli where it doesn't validate the TLS config. This is necessary to be able to connect to some Redis servers that are fronted by a self-signed certificate. This can either be self-hosted or hosted by some providers like Heroku.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.32%. Comparing base (4f00f52) to head (e4eb794).
Report is 15 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #980      +/-   ##
==========================================
- Coverage   67.13%   66.32%   -0.82%     
==========================================
  Files          29       29              
  Lines        4300     5740    +1440     
==========================================
+ Hits         2887     3807     +920     
- Misses       1135     1652     +517     
- Partials      278      281       +3     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.