Add support for queue overflow hook methods

[LeStarch]

When a port is set to 'drop' on overflow, there can be a memory leak should the port contain a resource that needed dedicated deallocation (e.g. Fw.Buffer). To fix this, we add a hook overflow option, which passes the port arguments to a function for handling (e.g. call to deallocate).

This PR contains the following items:

• Spec updated
• fpp-to-xml outputs 'hook' option
• fpp-to-cpp component test updated (active, queued)
• fpp-to-cpp templated test updated (active, queued)
• fpp-to-cpp component generation
  • Internal ports (async)
  • Serial ports (async)
  • Data product special ports (async)
  • Typed ports (async)
  • Commands (async)
• fpp-to-cpp template generation
  • Internal ports (async)
  • Serial ports (async)
  • Data product special ports (async)
  • Typed ports (async)
  • Commands (async)

F Prime integration work (to go):

• FppTest examples
• XML spec placeholder for 'hook'. Note: downgraded to 'drop' XML specification is deprecated.

[bocchino]

Looks good! Since we are no longer actively developing the XML model, I suggest we convert hook to drop before generating XML. We do something similar with data product special ports, converting them to ordinary ports before generating XML.

[LeStarch]

@bocchino did the downgrade from 'hook' to 'drop' in XML generation, along with a test that proves the feature.

[thomas-bc]

Peer review notes:

• rename overflowHook to cmdOverflowHook for commands, following the cmdHandler pattern for commands vs handler for ports

[LeStarch]

@bocchino I have fixed all review comments, please let me know if anything else is needed.

[bocchino]

Nicely done! This is a good addition to the modeling and code gen.

[bocchino]

@thomas-bc This looks good to me. Once you review and approve, I will merge!

[thomas-bc]

🚢 🇮🇹