feat: introducing MonoVertex

[whynowy]

Explain what this PR does.

[codecov]

Codecov Report

Attention: Patch coverage is 7.15250% with 688 lines in your changes missing coverage. Please review.

Project coverage is 58.48%. Comparing base (9cf7624) to head (d2c38ea).

Files	Patch %	Lines
pkg/apis/numaflow/v1alpha1/mono_vertex_types.go	0.00%	280 Missing ⚠️
pkg/reconciler/monovertex/controller.go	0.00%	277 Missing ⚠️
pkg/mvtxdaemon/server/daemon_server.go	0.00%	80 Missing ⚠️
pkg/reconciler/cmd/start.go	0.00%	25 Missing ⚠️
cmd/commands/mvtx_daemon_server.go	20.00%	19 Missing and 1 partial ⚠️
pkg/apis/numaflow/v1alpha1/scale.go	90.47%	2 Missing and 2 partials ⚠️
pkg/reconciler/util.go	0.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1911      +/-   ##
==========================================
- Coverage   59.82%   58.48%   -1.34%     
==========================================
  Files         286      291       +5     
  Lines       23689    24381     +692     
==========================================
+ Hits        14172    14260      +88     
- Misses       8588     9187     +599     
- Partials      929      934       +5     

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