KUBESAW-143: Add support for Go Templates in member operator

[fbm3307]

Getting the cached logic to have TTR and TR cache which can be further used in memberoperator for fetching the tiertemplates/TTRs .

This PR is related to
Member-Operator: codeready-toolchain/member-operator#666

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 13 lines in your changes missing coverage. Please review.

Project coverage is 78.60%. Comparing base (c883496) to head (e6b8c51).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/cluster/service.go	0.00%	13 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #481      +/-   ##
==========================================
- Coverage   78.95%   78.60%   -0.36%     
==========================================
  Files          52       52              
  Lines        2604     2617      +13     
==========================================
+ Hits         2056     2057       +1     
- Misses        490      503      +13     
+ Partials       58       57       -1     

Files with missing lines	Coverage Δ
pkg/cluster/service.go	73.29% <0.00%> (-5.77%)	⬇️

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[fbm3307]

will be doing this changes in member operator. hence closing it here