feat!: forbid importing '/r' from '/p' #5144

Job	Run time
build (1.21.x, GOARCH=amd64 GOOS=linux, gno)	24s
build (1.21.x, GOARCH=wasm GOOS=js, gno)	27s
build (1.22.x, GOARCH=amd64 GOOS=linux, gno)	20s
build (1.22.x, GOARCH=wasm GOOS=js, gno)	26s
test (1.21.x, _test.cmd)	1m 32s
test (1.21.x, _test.pkg)	47s
test (1.21.x, _test.gnolang.native)	31s
test (1.21.x, _test.gnolang.stdlibs)	50s
test (1.21.x, _test.gnolang.realm)	36s
test (1.21.x, _test.gnolang.pkg0)	1m 52s
test (1.21.x, _test.gnolang.pkg1)	6m 29s
test (1.21.x, _test.gnolang.pkg2)	4m 8s
test (1.21.x, _test.gnolang.other)	29s
test (1.22.x, _test.cmd)	1m 24s
test (1.22.x, _test.pkg)	51s
test (1.22.x, _test.gnolang.native)	26s
test (1.22.x, _test.gnolang.stdlibs)	54s
test (1.22.x, _test.gnolang.realm)	29s
test (1.22.x, _test.gnolang.pkg0)	1m 54s
test (1.22.x, _test.gnolang.pkg1)	6m 26s
test (1.22.x, _test.gnolang.pkg2)	4m 14s
test (1.22.x, _test.gnolang.other)	23s
upload-coverage	21s
	36m 13s

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