ByoClusterTemplate added for cluster class support

[shivi28]

What this PR does / why we need it:

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #536

Additional information

Special notes for your reviewer

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[shivi28]

Requesting @dharmjit to kindly review this

[codecov-commenter]

Codecov Report

Merging #540 (4647e57) into main (a87f08c) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #540      +/-   ##
==========================================
+ Coverage   63.63%   63.67%   +0.03%     
==========================================
  Files          25       26       +1     
  Lines        1936     1938       +2     
==========================================
+ Hits         1232     1234       +2     
  Misses        625      625              
  Partials       79       79              

Impacted Files	Coverage Δ
apis/infrastructure/v1beta1/byoclustertemplate.go	100.00% <100.00%> (ø)

[sachinkumarsingh092]

Is there no need for any observed state for ByoClusterTemplate i.e a ByoClusterTemplateStatus for cluster class?

[shivi28]

Is there no need for any observed state for ByoClusterTemplate i.e a ByoClusterTemplateStatus for cluster class?

Right now there is no benefit of having status subresource, but based on use case we can extend it in future.

[dharmjit]

LGTM

[sachinkumarsingh092]

LGTM

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