update ui and add output

[lachieh]

No description provided.

[rvolosatovs]

A successful set should not produce any output, but once error handling is wired up we'd want to print the error if it occurred (i.e.

wrpc/examples/web/rust/index.html

Lines 217 to 220 in 6a79943

	if (res != 0) {
	alert("failed to set value")
	return;
	}

), if the byte is 1, then what follows is:

• LEB-128 encoded uint32 (decoding in Rust: https://github.com/wrpc/wasm-tokio/blob/b245de13b716350faafc346d0516a8f40742508a/leb128-tokio/src/lib.rs#L127-L147)
• UTF-8 encoded string

A little trick, however, is that for cases where LEB-128 encoded uint value is below 128, it is equal to a byte u8 repr of the value. (so for each i where i < 127, encoding is just i).
For now we could just read the whole buffer and if it's length is 128 or lower, skip the first byte and print the rest as a UTF-8 encoded string. You can see an example of that in decoding of set result

Just an idea for a potential follow-up (which I will try to work on myself anyway at some point)

LGTM, thanks!

[rvolosatovs]

For reference, the string encoding is formally defined here: https://webassembly.github.io/spec/core/binary/values.html#names