feat: add convert_boxed and insert_boxed for InstructionTable #2924

Job	Run time
check no-default-features	15s
check serde	18s
check std	14s
test no_std	19s
test stable --no-default-features	56s
clippy	1m 17s
test stable	52s
docs	1m 13s
test stable --all-features	1m 19s
fmt	11s
test beta --no-default-features	50s
test beta	49s
test beta --all-features	1m 20s
test nightly --no-default-features	58s
test nightly	50s
test nightly --all-features	1m 15s
	12m 56s

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