[RPC]Implement InvocationCancel

[pragnagopa]

Need to implement InvocationCancel
This specifically impacts language workers that start in placeholder mode as language worker process will not restart as part of jobhost restarts.

From issue #1319,
TIMEOUT
A language worker should handle Function timeout/cancelation messages
A language worker should ACK if the Function gracefully timed out based on a configurable grace period
A language worker should provide a means for a Function to be notified of graceful shutdown
The host should send the timeout/cancelation message for a given Function execution to the language worker processing it
A language worker should wait for an ACK for a configurable grace period
The grace period should be configurable via the host.json (timeoutGracePeriod)
The grace period can be overridden per Function via function.json (timeoutGracePeriod)
The default grace period should be 1 second

[pragnagopa]

@yojagad - this is related to issue #5391 . Please take a quick look if this message can be useful to send to worker process to indicate invocation is timeout.

[fabiocav]

Moving to 72 for investigation as this may no longer be needed.

[liliankasem]

@yojagad @fabiocav was this investigated at all? Do we still need this?

[pragnagopa]

Tagging @soninaren - as he was looking to extend the support for CancellationToken to out-of-proc languages

[soninaren]

I believe this is still relevant. It may not be a cancellation token the functionality is still needed. It would need some design work to start with.

[fabiocav]

Duplicate of #2152