postMessage Data and Vector to a web worker, transferring buffer content

[kylebarron]

Change list

• Add force option onto hardClone to always clone, even if not necessary to be transferred. (defaults to false)
• preparePostMessage to:
  • hard clone backing ArrayBuffers if they're a view on a larger ArrayBuffer
  • Get a list of transferables
  • Assign DataType.typeId onto __type so that it can accurately be reconstructed on the other side of a postMessage
• rehydrateData and rehydrateVector to recreate full arrow classes from post messaged data
• Minimal test that transferring and rehydrating works! Using node's structuredClone