Add HorizonSource

[embano1]

A new HorizonSource is available reusing most of the code running in production from the VMware Event Broker Appliance Horizon event processor.

Fixes #392

Proposed Changes

• 🎁 Add HorizonSource
• 🧹 Standardize component names following <product>-source-<webhook|adapter|controller>, e.g. horizon-source-controller (also see Break up VSphereSource webhook into controller and webhook component #407)
• 🧹 Restructure and update configuration files to allow for multiple VMware sources

Pre-review Checklist

• At least 80% unit test coverage
• E2E tests for any new behavior
• Docs for any user-facing impact

Notes:

• E2E tests are not possible due to missing Horizon simulator/API (unit tests use mocking)
• Coverage decreases due to certain code paths only exercised in E2E tests (not implemented), e.g. deploying adapter for a HorizonSource

Release Note

A new source `HorizonSource` is available to retrieve events from VMware Horizon.

[codecov-commenter]

Codecov Report

Merging #416 (fc81a77) into main (9018e18) will decrease coverage by 15.38%.
The diff coverage is 35.07%.

@@             Coverage Diff             @@
##             main     #416       +/-   ##
===========================================
- Coverage   81.62%   66.23%   -15.39%     
===========================================
  Files          27       38       +11     
  Lines        1382     2070      +688     
===========================================
+ Hits         1128     1371      +243     
- Misses        226      655      +429     
- Partials       28       44       +16     

Impacted Files	Coverage Δ
pkg/reconciler/horizonsource/controller.go	0.00% <0.00%> (ø)
pkg/reconciler/horizonsource/deployment.go	0.00% <0.00%> (ø)
pkg/reconciler/horizonsource/horizonsource.go	0.00% <0.00%> (ø)
pkg/reconciler/horizonsource/serviceaccount.go	0.00% <0.00%> (ø)
pkg/horizon/horizon.go	29.22% <29.22%> (ø)
pkg/apis/sources/v1alpha1/horizonsource_types.go	50.00% <50.00%> (ø)
...g/apis/sources/v1alpha1/horizonsource_lifecycle.go	52.00% <52.00%> (ø)
pkg/horizon/adapter.go	73.29% <73.29%> (ø)
.../apis/sources/v1alpha1/horizonsource_validation.go	82.50% <82.50%> (ø)
...kg/apis/sources/v1alpha1/horizonsource_defaults.go	100.00% <100.00%> (ø)
... and 5 more

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[gabo1208]

This trailing spaces and I think is good to go

[gabo1208]

.