Add HTTPS support to Varnish cache using Hitch

[AbdelrahmanElawady]

Add HTTPS support to Varnish based CIAB instances using Hitch and configuring certificates using TO data.

Closes: #7722

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Which Traffic Control components are affected by this PR?

• Traffic Control Cache Config (t3c, formerly ORT)
• CDN in a Box

What is the best way to verify this PR?

• Run CIAB as mentioned in Add parents to varnish cache #7669 with Varnish as Edge (requests between cache servers are using HTTP. So, Edge will only verify this PR).
• Try the readiness check by running docker-compose -f docker-compose.readiness.yml up
• Or just run docker-compose exec enroller curl -L --insecure "https://video.demo1.mycdn.ciab.test"
• It should serve the request with no problem.

PR submission checklist

• This PR has tests
• This PR has documentation
• This PR has a CHANGELOG.md entry
• This PR DOES NOT FIX A SERIOUS SECURITY VULNERABILITY (see the Apache Software Foundation's security guidelines for details)

[codecov]

Codecov Report

Merging #7725 (17fa8f1) into master (75ec56f) will decrease coverage by 36.13%.
Report is 102 commits behind head on master.
The diff coverage is 49.17%.

@@              Coverage Diff              @@
##             master    #7725       +/-   ##
=============================================
- Coverage     65.05%   28.92%   -36.13%     
  Complexity       98       98               
=============================================
  Files           314      596      +282     
  Lines         12365    76703    +64338     
  Branches        907       90      -817     
=============================================
+ Hits           8044    22190    +14146     
- Misses         3968    52435    +48467     
- Partials        353     2078     +1725     

Flag	Coverage Δ
golib_unit	53.75% <60.68%> (?)
grove_unit	12.02% <ø> (?)
t3c_unit	5.96% <2.80%> (?)
traffic_monitor_unit	26.33% <0.00%> (?)
traffic_ops_unit	21.62% <ø> (?)
traffic_portal_v2	?
traffic_stats_unit	10.78% <ø> (?)
unit_tests	25.73% <49.17%> (-48.05%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
cache-config/t3c-apply/config/config.go	0.00% <0.00%> (ø)
cache-config/t3c-apply/torequest/cmd.go	0.00% <0.00%> (ø)
cache-config/t3c-check-refs/t3c-check-refs.go	1.78% <0.00%> (ø)
cache-config/t3c-generate/cfgfile/varnish.go	0.00% <0.00%> (ø)
cache-config/t3c-generate/config/config.go	0.81% <0.00%> (-0.08%)	⬇️
cache-config/t3c-generate/t3c-generate.go	0.00% <ø> (ø)
lib/go-atscfg/parentabstraction.go	80.00% <ø> (ø)
lib/go-tc/cdns.go	0.00% <ø> (ø)
lib/go-tc/deliveryservice_servers.go	0.00% <0.00%> (ø)
lib/go-tc/federation_resolver.go	45.45% <0.00%> (ø)
... and 19 more

... and 475 files with indirect coverage changes

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[limited]

I've looked at code, looks good so far. Still need to pull down and test