refactor: splicer WIT and generated bindings #819

Job	Run time
build-splicer (ubuntu-latest)	1m 55s
lint	13s
build-splicer (windows-latest)	3m 49s
build (weval)	13s
build (debug)	9s
build (release)	7s
test-example	42s
test (23.10.0, windows-latest, weval)	12m 44s
test (23.10.0, ubuntu-latest, release)	6m 36s
test (23.10.0, ubuntu-latest, debug)	7m 23s
test (23.10.0, windows-latest, debug)	9m 0s
test (23.10.0, macos-latest, release)	5m 5s
test (23.10.0, macos-latest, weval)	8m 32s
test (23.10.0, ubuntu-latest, weval)	9m 57s
test (23.10.0, windows-latest, release)	8m 0s
test (23.10.0, macos-latest, debug)	6m 41s
	1h 21m 6s

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