feat: enable restful daemon client option for UX server

[whynowy]

Added an option to use RESTful client to access daemon service.

  ### The protocol used to connect to the Pipeline daemon service from Numaflow UX server.
  #   Could be either 'grpc' or 'http', defaults to 'grpc'.
  # 
  # server.daemon.client.protocol: grpc

This is useful when there's a breaking change on daemon service protobuf, while the pipeline can not run the same version of code as the UX server (e.g. UX server is installed in cluster scope, while controllers are in namespace scope, UX server and controllers do not follow the same release cadence). In this case, using RESTful client will have better UX experience, which will not display errors.

[codecov]

Codecov Report

Attention: Patch coverage is 18.18182% with 54 lines in your changes missing coverage. Please review.

Project coverage is 53.03%. Comparing base (6ecf01e) to head (2d7b0be).

Files	Patch %	Lines
server/apis/v1/handler.go	0.00%	30 Missing ⚠️
cmd/commands/server.go	50.00%	11 Missing ⚠️
server/routes/routes.go	0.00%	7 Missing ⚠️
server/cmd/server/start.go	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1826      +/-   ##
==========================================
+ Coverage   52.11%   53.03%   +0.92%     
==========================================
  Files         282      282              
  Lines       27286    27313      +27     
==========================================
+ Hits        14219    14485     +266     
+ Misses      12233    11984     -249     
- Partials      834      844      +10     

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[vigith]

nice tests generation :)