Add Wasmtime latest/LTS support with LTS default #871

Job	Run time
docs-pr	6s
spell check with typos	5s
build-wasm-examples / build-docker-image	34s
build-wasm-examples / build-wasm-examples (latest, wasmtime_latest)	2m 46s
build-wasm-examples / build-wasm-examples (lts)	2m 45s
report-ci-status	4s
rust	-1s
	6m 19s

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