component HostFunc: add call hooks for calling and returning from host

[pchickey]

This needs more fleshing out and testing.

Without this patch, @acfoltzer reported an unexpected trace when calling into a component:

#    7.148 p.v0 XQD| 2023-09-27T00:39:46.963691Z TRACE request{id=00000000-0000-0000-0000-000000000000}:service{sid=enabled}: xqd::guest::component: call_hook=CallingWasm\n
#    7.148 p.v0 XQD| 2023-09-27T00:39:46.964430Z TRACE request{id=00000000-0000-0000-0000-000000000000}:service{sid=enabled}: xqd::guest::component: call_hook=CallingWasm\n
#    7.148 p.v0 XQD| 2023-09-27T00:39:46.964485Z TRACE request{id=00000000-0000-0000-0000-000000000000}:service{sid=enabled}: xqd::guest::component: call_hook=ReturningFromWasm\n
#    7.148 p.v0 XQD| 2023-09-27T00:39:46.964932Z TRACE request{id=00000000-0000-0000-0000-000000000000}:service{sid=enabled}: xqd::guest::component: call_hook=ReturningFromWasm\n

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[pchickey]

I forgot about this and I don't really think its critical, we can let someone re-open it if they need to.