Investigate the impact of endpoint startup time on Functions that are executed infrequently

[lailabougria]

There are cases in which a system has functions that are executed infrequently. We'd like to investigate the impact endpoint startup time may have on these cases.

A possible avenue is to investigate is to spike whether some of the work that's currently performed during startup (e.g. assembly scanning for message and handler types, composing receive pipeline) could be done at compile-time instead to reduce cold-start times.

There is a workaround as Azure Functions has a premium offering that allows, at a cost, to keep functions alive.