The storage table model is missing the `signedIdentites`

The table resource manager API [model](https://github.com/Azure/azure-rest-api-specs/blob/e260efc341b22e018718d1c2e85107db5af52802/specification/storage/resource-manager/Microsoft.Storage/stable/2021-06-01/table.json#L425) is missing the `signedIdentites` property, comparing to the [data plane alternatives](https://docs.microsoft.com/en-us/rest/api/storageservices/set-table-acl#request-body).

It is expected to be as the file share [model](https://github.com/Azure/azure-rest-api-specs/blob/e260efc341b22e018718d1c2e85107db5af52802/specification/storage/resource-manager/Microsoft.Storage/stable/2021-06-01/file.json#L900), which has the `signedIdentities` property defined in its resource manager API.

Start with specification/storage/resource-manager/Microsoft.Storage/stable/2021-06-01/table.json at the table model referenced in the issue, then compare its properties with file.json around the linked file-share model. Add the missing signedIdentities property consistently with that model and verify the table resource manager schema includes it.

Written by the indexing model from the issue text.