feat: add support for embedded etcd

[vishal-chdhry]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 175 lines in your changes missing coverage. Please review.

Project coverage is 0.00%. Comparing base (c0d75ef) to head (d6eb242).

Files with missing lines	Patch %	Lines
pkg/storage/etcd/store.go	0.00%	114 Missing ⚠️
pkg/storage/etcd/new.go	0.00%	43 Missing ⚠️
pkg/storage/store.go	0.00%	10 Missing ⚠️
pkg/app/policyserver.go	0.00%	7 Missing ⚠️
pkg/app/opts/options.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff           @@
##            main    #213    +/-   ##
======================================
  Coverage   0.00%   0.00%            
======================================
  Files         30      32     +2     
  Lines      17670   17837   +167     
======================================
- Misses     17670   17837   +167     

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