feat!: forbid importing '/r' from '/p' #5159

Job	Run time
build (1.21.x, GOARCH=amd64 GOOS=linux, gno)	23s
build (1.21.x, GOARCH=wasm GOOS=js, gno)	25s
build (1.22.x, GOARCH=amd64 GOOS=linux, gno)	24s
build (1.22.x, GOARCH=wasm GOOS=js, gno)	25s
test (1.21.x, _test.cmd)	1m 26s
test (1.21.x, _test.pkg)	58s
test (1.21.x, _test.gnolang.native)	28s
test (1.21.x, _test.gnolang.stdlibs)	47s
test (1.21.x, _test.gnolang.realm)	34s
test (1.21.x, _test.gnolang.pkg0)	1m 49s
test (1.21.x, _test.gnolang.pkg1)	6m 35s
test (1.21.x, _test.gnolang.pkg2)	4m 16s
test (1.21.x, _test.gnolang.other)	31s
test (1.22.x, _test.cmd)	1m 29s
test (1.22.x, _test.pkg)	40s
test (1.22.x, _test.gnolang.native)	24s
test (1.22.x, _test.gnolang.stdlibs)	45s
test (1.22.x, _test.gnolang.realm)	26s
test (1.22.x, _test.gnolang.pkg0)	1m 46s
test (1.22.x, _test.gnolang.pkg1)	6m 21s
test (1.22.x, _test.gnolang.pkg2)	4m 6s
test (1.22.x, _test.gnolang.other)	22s
upload-coverage	0s
	35m 20s

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