Update a Sharing Right's metadata in Subproject

Updates a Sharing Right's metadata by merging existing key–value pairs on Sharing Right with the provided key–value pairs.

Send in an object with key-value pairs to update the metadata, for instance:

{
  myDataKey: "abc",
}

To delete a field from the metadata, send in null as the value, for instance:

{
  myDataKey: null,
}