Add wasmtime to CI. #676

Job	Run time
test (macos-latest)	2m 16s
test (ubuntu-latest)	2m 12s
test (windows-latest)	5m 6s
test-qemu	7m 54s
test-macintel	51s
test-bsd (freebsd, 14.2, -test.v)	1m 39s
test-vm (dragonfly, vmactions/dragonflybsd-vm@v1, -test.v)	3m 7s
test-bsd (netbsd, 10.0, -test.v)	1m 59s
test-vm (illumos, vmactions/omnios-vm@v1, -test.v)	6m 15s
test-bsd (freebsd, arm64, 14.2, -test.v -test.short)	2m 59s
test-wasip1	3m 33s
test-vm (solaris, vmactions/solaris-vm@v1, -tags sqlite3_dotlk, -test.v)	3m 48s
test-bsd (netbsd, arm64, 10.0, -test.v -test.short)	3m 13s
test-bsd (openbsd, 7.6, -test.v -test.short)	1m 36s
	46m 28s

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