Add FluentForward receiver

[koenvandesande]

Is your feature request related to a problem? Please describe.
We have our Docker containers running with the fluentd logging driver. This allows us to inject tags and attributes before using the CloudWatch exporter (and having them stored as JSON logs).
Using the CloudWatch log driver directly on the Docker containers was less flexible. Also, we want to send out some log files from disk (through filelogreceiver) to CloudWatch, and we want to use the collector for both.

Describe the solution you'd like
Add the fluentforwardreceiver from OpenTelemetry contrib. Link
Having just the filelogreceiver for logs is too limiting.

[github-actions]

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