feat: source to sink with an optional transformer without ISB

[vigith]

Source to Sink via an optional transformer without ISB.

Manual Testing

apiVersion: numaflow.numaproj.io/v1alpha1
kind: MonoVertex
metadata:
  name: ceres-mono-vertex
spec:
  replicas: 5
  source:
    udsource:
      container:
        image: docker.xxx.com/eventbus-numaflow:0.5.1
        args:
          - --spring.config.location=file:/conf/eventbus-source-config.yaml
          - --numaflow.handler=eventbus-source
        env:
          - name: config_file_path
            value: /conf/eventbus-source-config.yaml
        volumeMounts:
          - name: eventbus-source-config-volume
            mountPath: /conf

  sink:
    udsink:
      container:
        image: docker.xxx.com/blackhole-sink:stable

  volumes:
    - name: eventbus-source-config-volume
      configMap:
        name: eventbus-source-config
        items:
          - key: configuration
            path: eventbus-source-config.yaml

[codecov]

Codecov Report

Attention: Patch coverage is 29.50820% with 43 lines in your changes missing coverage. Please review.

Project coverage is 58.26%. Comparing base (eb2717e) to head (ad6bc66).

Files	Patch %	Lines
serving/source-sink/src/source.rs	30.50%	41 Missing ⚠️
pkg/apis/numaflow/v1alpha1/mono_vertex_types.go	0.00%	1 Missing ⚠️
serving/source-sink/src/message.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1904      +/-   ##
==========================================
+ Coverage   58.18%   58.26%   +0.07%     
==========================================
  Files         291      293       +2     
  Lines       24381    24351      -30     
==========================================
+ Hits        14186    14187       +1     
+ Misses       9260     9230      -30     
+ Partials      935      934       -1     

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[whynowy]

This is going out of control.

1. Image build time in the CI increased from <2 mins to > 7 mins
2. Image size and security vulunabilities.

[vigith]

we can handle this in follow up PR, already created an action item.

[whynowy]

What is the reason the client needs to keep the proto files?

[vigith]

we do not need to, we can copy at build time. this was the reason for #1910

[vigith]

we will handle this in follow up PR.

[vigith]

i am reviewing this PR, please do not merge.