Add support for logs coming from subscription filters

[constanca-m]

Component(s)

extension/encoding/awslogsencoding

Is your feature request related to a problem? Please describe.

I would like to be able to use the awslogsencoding extension to unmarshal cloudwatch logs coming from subscription filters.

Describe the solution you'd like

The new format should cover the same use cases as the cloudwatch log unmarshaler implemented in awsfirehosereceiver. You can see it here.

Describe alternatives you've considered

No response

Additional context

No response

[github-actions]

Pinging code owners for extension/encoding/awslogsencodingextension: @axw @constanca-m. See Adding Labels via Comments if you do not have permissions to add labels yourself. For example, comment '/label priority:p2 -needs-triaged' to set the priority and remove the needs-triaged label.