[receiver/skywalking] Create skywalking component folder/structure

[JaredTan95]

Description:

1st PR: Create skywalking component folder/structure and finish factory , config unit test.

Link to tracking Issue: #7954
Testing:

Documentation:
added skywalking receiver README.md

[JaredTan95]

thanks @pmm-sumo again

[pmm-sumo]

I think it looks good for the first phase now. Lets see what @jpkrohling and others say :)

[jpkrohling]

This is also failing:

Using versioning file /home/runner/work/opentelemetry-collector-contrib/opentelemetry-collector-contrib/versions.yaml
verifyAllModulesInSet failed: Module github.com/open-telemetry/opentelemetry-collector-contrib/receiver/skywalkingreceiver (defined in /home/runner/work/opentelemetry-collector-contrib/opentelemetry-collector-contrib/receiver/skywalkingreceiver/go.mod) is not listed in any module set.

Please, go over the contribution guidelines and check which files need to be changed for new components.

[JaredTan95]

This is also failing:

Using versioning file /home/runner/work/opentelemetry-collector-contrib/opentelemetry-collector-contrib/versions.yaml
verifyAllModulesInSet failed: Module github.com/open-telemetry/opentelemetry-collector-contrib/receiver/skywalkingreceiver (defined in /home/runner/work/opentelemetry-collector-contrib/opentelemetry-collector-contrib/receiver/skywalkingreceiver/go.mod) is not listed in any module set.

Please, go over the contribution guidelines and check which files need to be changed for new components.

I did not change it , especially. because this is the 1st PR and the receiver does not fully functional.
I will update this, thanks.