feat(stdlib): add `path` package (#1065) #9

Job	Run time
build (1.19.x, GOARCH=amd64 GOOS=linux, gno)	46s
build (1.19.x, GOARCH=wasm GOOS=js, gno)	37s
build (1.20.x, GOARCH=amd64 GOOS=linux, gno)	38s
build (1.20.x, GOARCH=wasm GOOS=js, gno)	32s
test (1.19.x, _test.cmd)	1m 8s
test (1.19.x, _test.pkg)	1m 16s
test (1.19.x, _test.gnolang.native)	40s
test (1.19.x, _test.gnolang.stdlibs)	1m 5s
test (1.19.x, _test.gnolang.realm)	38s
test (1.19.x, _test.gnolang.pkg0)	1m 54s
test (1.19.x, _test.gnolang.pkg1)	8m 45s
test (1.19.x, _test.gnolang.pkg2)	5m 38s
test (1.19.x, _test.gnolang.other)	58s
test (1.20.x, _test.cmd)	1m 36s
test (1.20.x, _test.pkg)	1m 10s
test (1.20.x, _test.gnolang.native)	53s
test (1.20.x, _test.gnolang.stdlibs)	1m 30s
test (1.20.x, _test.gnolang.realm)	1m 11s
test (1.20.x, _test.gnolang.pkg0)	2m 29s
test (1.20.x, _test.gnolang.pkg1)	9m 40s
test (1.20.x, _test.gnolang.pkg2)	6m 50s
test (1.20.x, _test.gnolang.other)	1m 0s
	50m 54s

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