Adding scaffolding for the tkg-autoscaler package

[saji-pivotal]

What this PR does / why we need it

Which issue(s) this PR fixes

Fixes ##2320

Describe testing done for PR

• Created and published the autoscaler package to my personal registry
• Created a management-cluster on AWS
• Used tanzu package install to install the package from my personal registry to the AWS cluster
• Verified that the autoscaler deployment was running

Release note

Adds scaffolding for the autoscaler package

PR Checklist

• Squash the commits into one or a small number of logical commits
  
• Use good commit messages
• Ensure PR contains terms all contributors can understand and links all contributors can access

Additional information

Special notes for your reviewer

[codecov]

Codecov Report

Merging #2393 (417bc44) into main (4494221) will increase coverage by 0.05%.
The diff coverage is n/a.

❗ Current head 417bc44 differs from pull request most recent head 2f8ad9a. Consider uploading reports for the commit 2f8ad9a to get more accurate results

@@            Coverage Diff             @@
##             main    #2393      +/-   ##
==========================================
+ Coverage   42.32%   42.38%   +0.05%     
==========================================
  Files         398      396       -2     
  Lines       39693    39026     -667     
==========================================
- Hits        16799    16540     -259     
+ Misses      21308    20943     -365     
+ Partials     1586     1543      -43     

Impacted Files	Coverage Δ
...til/clusterbootstrapclone/clusterbootstrapclone.go	66.57% <0.00%> (-3.74%)	⬇️
...ons/controllers/packageinstallstatus_controller.go	80.57% <0.00%> (-0.07%)	⬇️
pkg/v1/webhooks/webhooks.go	0.00% <0.00%> (ø)
...ddons/webhooks/clusterbootstraptemplate_webhook.go
addons/webhooks/clusterbootstrap_webhook.go
addons/controllers/clusterbootstrap_controller.go	68.63% <0.00%> (+0.42%)	⬆️
addons/controllers/machine_controller.go	69.52% <0.00%> (+0.83%)	⬆️
pkg/v1/webhooks/certificates.go	8.40% <0.00%> (+1.20%)	⬆️
pkg/v1/util/patchset/patchset.go	100.00% <0.00%> (+3.57%)	⬆️
...g/v2/tkr/controller/tkr-source/pkgcr/reconciler.go	66.00% <0.00%> (+15.45%)	⬆️

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[imikushin]

<< awesome functionality >>

I like this 😸

[imikushin]

Should we elaborate though? Even if it's very few concrete words, it'd still be better.

[imikushin]

Thanks @saji-pivotal !