Add support for VPC flow log in plain text format

[constanca-m]

Component(s)

extension/encoding/awslogsencoding

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

VPC flow logs can be sent to S3 either in plain text or parquet format.

Describe the solution you'd like

Add support for the logs sent in plain text format.

Describe alternatives you've considered

No response

Additional context

See main issue #38861.

[github-actions]

Pinging code owners:

• extension/encoding/awslogsencoding: @axw @constanca-m

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[crobert-1]

Issue filed by code owner, removing needs triage