Handle host function calls the same as other instructions in the Wasmi executor about wasmi HOT 1 CLOSED

I performed some local benchmarks with an experimental branch that simply removes host function calls and all their related handlers in the Wasmi executor to emulate what would happen if we were to implement this PR naively. The benchmarks showed no significant change indicating that either the experiment is flawed or that the optimizer can do a good enough job to reduce both cases to roughly the same assembly via aggressive inlining etc.

Further investigation needed.

The experimental branch can be found here: https://github.com/wasmi-labs/wasmi/tree/rf-experiment-host-fn-calls-nop

from wasmi.