Removing writemultiple operation generation for http

> However, wouldn't it be better to never generate a TD with it?

Good point, I removed it for now alongside the `handleWriteMultipleProperties` method in order to not confuse people. However, note that in the HTTP server, the write meta operations are actually added to the `op` array despite having no corresponding handler method defined:

https://github.com/eclipse-thingweb/node-wot/blob/227be532bc98f5f6c8aeb4abc9de07cccca0ce71/packages/binding-http/src/http-server.ts#L346-L366

_Originally posted by @JKRhb in https://github.com/eclipse-thingweb/node-wot/pull/1086#issuecomment-1721530665_