DOCA stage split: source + convert

[e-ago]

Description

Split original DOCA Source Stage in two stages:

• Source stage to receive and forward packets with the new RawPacketMessage
• Convert stage to convert from RawPacketMessage to MessageMeta format

By Submitting this PR I confirm:

• I am familiar with the Contributing Guidelines.
• When the PR is ready for review, new or existing tests cover these changes.
• When the PR is ready for review, the documentation is up to date with these changes.

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[cwharris]

/ok to test

[mdemoret-nv]

/ok to test

[mdemoret-nv]

/ok to test

[mdemoret-nv]

/ok to test

[mdemoret-nv]

/ok to test

[mdemoret-nv]

Merging before CI is passing since the errors are all in DOCA files.

[mdemoret-nv]

/merge