feat(p/uint256): uint256 (#1778) #72

Job	Run time
build (1.21.x, GOARCH=amd64 GOOS=linux, gno)	28s
build (1.21.x, GOARCH=wasm GOOS=js, gno)	27s
test (1.21.x, _test.cmd)	1m 25s
build (1.22.x, GOARCH=amd64 GOOS=linux, gno)	22s
test (1.21.x, _test.pkg)	40s
build (1.22.x, GOARCH=wasm GOOS=js, gno)	25s
test (1.21.x, _test.gnolang.native)	35s
test (1.21.x, _test.gnolang.stdlibs)	53s
test (1.21.x, _test.gnolang.realm)	33s
test (1.21.x, _test.gnolang.pkg0)	1m 59s
test (1.21.x, _test.gnolang.pkg1)	6m 14s
test (1.21.x, _test.gnolang.pkg2)	4m 15s
test (1.21.x, _test.gnolang.other)	31s
test (1.22.x, _test.cmd)	1m 22s
test (1.22.x, _test.pkg)	37s
test (1.22.x, _test.gnolang.native)	28s
test (1.22.x, _test.gnolang.stdlibs)	1m 5s
test (1.22.x, _test.gnolang.realm)	40s
test (1.22.x, _test.gnolang.pkg0)	1m 49s
test (1.22.x, _test.gnolang.pkg1)	6m 14s
test (1.22.x, _test.gnolang.pkg2)	4m 19s
test (1.22.x, _test.gnolang.other)	33s
upload-coverage	8s
	36m 2s

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