don't sync values which are `ref`'d

Right now, in setPValueToY and insertPValueToY from bindProxyAndYMap and bindProxyAndYArray functions respectively, it’s not checked that a value stored in valtio (a “p” value) is ref’d.

As a result, non-proxied objects are subscribed to, resulting in an error within subscribe

Uncaught TypeError: Cannot read properties of undefined (reading 'add')
proxyObject[LISTENERS].add(listener);

Expected behavior is that values which are ref'd (refSet.has(value) === true) should be excluded from syncing.

[dai-shi]

Published: https://www.npmjs.com/package/valtio-yjs/v/0.3.1

[dai-shi]

#23 is updated.