Convert the napatech packet source to a plugin

[jlucovsky]

Continuation of #11651

This PR contains the changes to distribute and build the Napatech source modules as a "capture plugin".

Describe changes:

• Converted the Napatech source modules to be suitable for a capture plugin
• User-level upgrade documentation

Updates:

• Doc update -- use "Napatech" instead of "NAPATECH"
• Revert unnecessary change to decode module name -- NapatechDecode.
• Combine like commits (remove unnecessary fixup commit)
• Doc tweaks per review feedback

Provide values to any of the below to override the defaults.

• To use an LibHTP, Suricata-Verify or Suricata-Update pull request, link to the pull request in the respective _BRANCH variable.
• Leave unused overrides blank or remove.

SV_REPO= SV_BRANCH= SU_REPO= SU_BRANCH= LIBHTP_REPO= LIBHTP_BRANCH=