feat(gnovm): disallow internal imports #14168

Job	Run time
lint (1.23.x)	48s
mod-tidy (1.23.x)	2m 44s
test (1.23.x)	1m 5s
gno2go (1.23.x)	54s
Run gno fmt on examples / fmt	36s
Check generated files are up to date / generated	39s
	6m 46s

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