feat(stdlib): add `net/url` package #10

Job	Run time
build (1.20.x, GOARCH=amd64 GOOS=linux, gno)	48s
build (1.20.x, GOARCH=wasm GOOS=js, gno)	40s
test (1.20.x, _test.cmd)	1m 49s
build (1.21.x, GOARCH=amd64 GOOS=linux, gno)	49s
test (1.20.x, _test.pkg)	1m 13s
build (1.21.x, GOARCH=wasm GOOS=js, gno)	33s
test (1.20.x, _test.gnolang.native)	56s
test (1.20.x, _test.gnolang.stdlibs)	1m 57s
test (1.20.x, _test.gnolang.realm)	1m 12s
test (1.20.x, _test.gnolang.pkg0)	2m 33s
test (1.20.x, _test.gnolang.pkg1)	8m 21s
test (1.20.x, _test.gnolang.pkg2)	6m 48s
test (1.20.x, _test.gnolang.other)	1m 15s
test (1.21.x, _test.cmd)	1m 32s
test (1.21.x, _test.pkg)	1m 21s
test (1.21.x, _test.gnolang.native)	59s
test (1.21.x, _test.gnolang.stdlibs)	1m 39s
test (1.21.x, _test.gnolang.realm)	1m 13s
test (1.21.x, _test.gnolang.pkg0)	2m 33s
test (1.21.x, _test.gnolang.pkg1)	10m 51s
test (1.21.x, _test.gnolang.pkg2)	5m 42s
test (1.21.x, _test.gnolang.other)	1m 1s
	55m 45s

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