Use bless rust SDK for http plugin

[zees-dev]

The HTTP plugin is re-implemented in javy.
Ideally we should use the rust SDK's http plugin (as single source of truth).
The core discrepancy are here:

• javy-bless-plugins/src/fetch/blockless.rs

  Lines 80 to 89 in d2b6af5

  	if rs == u32::MAX {
  	continue;
  	} else if rs != 0 {
  	return Err(HttpErrorKind::from(rs));
  	} else {
  	match num.cmp(&0) {
  	Ordering::Greater => vec.extend_from_slice(&buf[0..num as _]),
  	_ => break,
  	}
  	}

• https://github.com/blocklessnetwork/sdk-rust/blob/1d36eba1bed03175863c2153fc196c8ac148f753/src/http.rs#L94-L97

The fix needs to be ported to the rust-sdk; a new release needs to be made; and then the plugin should replace low level host calls with the rust sdk's ones.