[receiver/skywalking] add Skywalking tracing receiver impl

[JaredTan95]

Description: add Skywalking tracing receiver impl

1. impl skywalking grpc/http channel to receiver skywalking agent tracing data.
2. dummy response skywalking's grpc service.

Link to tracking Issue: #7954

Testing: tested with following steps:

1. otel config yaml:

receivers:
  # The following demonstrates how to enable protocols with defaults.
  skywalking/defaults:
    protocols:
      grpc:
  skywalking:
    protocols:
      grpc:
        endpoint: 0.0.0.0:11800
      http:
        endpoint: 0.0.0.0:12800
  skywalking/customname:
    protocols:
      http:
        endpoint: 0.0.0.0:12801

exporters:
  jaeger:
    endpoint: "jaeger:14250"
    tls:
      insecure: true

processors:
  batch:

service:
  pipelines:
    traces:
      receivers: [skywalking]
      processors: [batch]
      exporters: [jaeger]

3. jaeger ui tracing view:

Documentation:

[dashpole]

cc @jpkrohling, who I believe is sponsoring the component

[caoheyang]

Hi Jared,

@JaredTan95 I have a quick question, when I want to use skywalking tracing receiver, should I use opentelemetry agent for java or skywalking agent for java?

Thanks,

Heyang

[JaredTan95]

skywalking agent

[caoheyang]

Thanks, Jared,
So ,how to use opentelemetry-collector receiver the skywalking trace info?
export anothor port for opentelemetry-collecto?

Heyang

[JaredTan95]

As described by #8549 (comment):

receivers:
  skywalking:
    protocols:
      grpc:
        endpoint: 0.0.0.0:11800
      http:
        endpoint: 0.0.0.0:12800

exporters:
  jaeger:
    endpoint: "jaeger:14250"
    tls:
      insecure: true

processors:
  batch:

service:
  pipelines:
    traces:
      receivers: [skywalking]
      processors: [batch]
      exporters: [jaeger]

You shuold add skywalking receiver, and then, you can change the Skywalking OAP Address to otel collecotr 11800 port in skywalking agent config.

[caoheyang]

OKay, Thanks a lot ,Jared, I will try it.

Regards,
Heyang