rune: Remove a number of static_type's #1781

Job	Run time
rustfmt	13s
clippy	2m 0s
docs	3m 36s
msrv	1m 33s
nightly	4m 38s
basics	1s
wasm	1m 8s
test_doc	5m 9s
no_std (ubuntu-latest, minimal)	1m 19s
test_lib	4m 3s
no_std (macos-latest, minimal)	1m 55s
build_feature (alloc)	2m 45s
build_feature (cli)	2m 37s
test_miri (rune, runtime:: hir::arena:: --skip runtime::vm:: --skip runtime::vm_execution:: )	3m 9s
build_feature (cli,doc)	2m 33s
test_rune	2m 43s
test_miri (rune-alloc)	2m 49s
build_feature (cli,fmt)	2m 30s
build_feature (doc)	2m 20s
build_feature (workspace)	2m 14s
build_feature (languageserver)	2m 11s
build_feature (byte-code)	2m 47s
build_feature (capture-io)	2m 47s
build_feature (emit)	2m 16s
	59m 16s

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