cvm-rs: Add jpegResizeEncode(), remove usage of sharp

sharp sucks.

cvm-rs/index.js

@@ -2,9 +2,9 @@
 import { createRequire } from 'module';
 const require = createRequire(import.meta.url);
 
-let {guacDecode, guacEncodeImpl, jpegEncode} = require('./index.node');
+let {guacDecode, guacEncodeImpl, jpegEncode, jpegResizeEncode} = require('./index.node');
 
-export { guacDecode, jpegEncode };
+export { guacDecode, jpegEncode, jpegResizeEncode };
 
 // shim for js->rust interop, because napi-rs kind of blows in this regard
 export function guacEncode(...args) {