[OCB] Copy+Update CWAgent's awsapplicationsignals into the processor/ directory

[jj22ee]

Description:

This PR is to create the initial baseline commit of the Application Signals Processor that future commits will modify in order to properly make this processor an externally usable Go module

This PR does 2 things

1. Copy the following directory with 0 changes into the processor directory - https://github.com/aws/amazon-cloudwatch-agent/tree/main/plugins/processors/awsapplicationsignals
2. Rename copied directory from awsapplicationsignals to awsapplicationsignalsprocessor

Link to tracking Issue:

Testing:

N/A. As this PR is just a direct copy + rename of the appsignals processor, nothing is expected to work.

Documentation:

[mxiamxia]

Approved PR as we're just copying the code over.

[jj22ee]

The first 2 commits are for the direct copy of the Application Signals Processor.

In the 3rd commit, additional changes are made:

1. Update all imports of github.com/aws/amazon-cloudwatch-agent/plugins/processors/awsapplicationsignals to github.com/amazon-contributing/opentelemetry-collector-contrib/processor/awsapplicationsignalsprocessor
2. Add Makefile
3. Add processor/awsapplicationsignalsprocessor/go.mod and go.sum
4. Copy over ecsutil.go from CWAgent
   • Remove dependency on github.com/aws/amazon-cloudwatch-agent/translator/config by copying the config.RUN_IN_CONTAINER and config.RUN_IN_CONTAINER_TRUE values
5. Copy over httpclient.go from CWAgent
6. Update processor/awsapplicationsignalsprocessor/internal/normalizer/attributesnormalizer.go
   • Change attribute value of common.MetricAttributeTelemetryAgent from "CWAgent/%s", version.Number() to opentelemetry-collector/%s", GetCollectorVersion().
   • Add processor/awsapplicationsignalsprocessor/internal/normalizer/version_info.go to get the Collector Version via GetCollectorVersion()
7. Remove eksdetector dependency in processor/awsapplicationsignalsprocessor/internal/resolver/kubernetes_test.go

[jj22ee]

The check-links workflow is failing due to new markdown-link-check version. It is unrelated to this PR.
It was fixed in upstream via open-telemetry#36231