[pkg/stanza] Support octet counting for syslog RFC3164

[Caleb-Hurshman]

Component(s)

pkg/stanza

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

The current octet counting implementation assumes that octet counting framing is RFC5424, but some vendors (e.g., FortiGate) use octet counting framing with RFC3164 message formats.

Describe the solution you'd like

Add support for RFC6587 octet counting framing with RFC3164 message format.

Describe alternatives you've considered

No response

Additional context

No response

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[github-actions]

Pinging code owners:

• pkg/stanza: @andrzej-stencel

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[paulojmdias]

@Caleb-Hurshman, assigning to you as you already have an open PR 🙏