refactor: move all describe, describe_tree and dot-viz code to IR ins… #4

Job	Run time
check-features	9m 33s
check-wasm	6m 4s
integration-test (ubuntu-latest)	3m 21s
integration-test (windows-latest)	8m 50s
test (ubuntu-latest)	5m 58s
test (windows-latest)	17m 29s
	51m 15s

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