[Feature Request]: Add a De-ID PTransform for the DicomIO

### What would you like to happen?

We currently have a Java SDK Dicom IO to allow users to connect Beam pipelines to Dicom stores.

A common customer use case is to then de-identify the dicom data. This FR proposes creating a new PTransform that calls the [Cloud Healthcare API](https://cloud.google.com/healthcare-api/docs/how-tos/dicom-deidentify) under the hood.

### Issue Priority

Priority: 3 (nice-to-have improvement)

### Issue Components

- [ ] Component: Python SDK
- [x] Component: Java SDK
- [ ] Component: Go SDK
- [ ] Component: Typescript SDK
- [X] Component: IO connector
- [ ] Component: Beam examples
- [ ] Component: Beam playground
- [ ] Component: Beam katas
- [ ] Component: Website
- [ ] Component: Spark Runner
- [ ] Component: Flink Runner
- [ ] Component: Samza Runner
- [ ] Component: Twister2 Runner
- [ ] Component: Hazelcast Jet Runner
- [ ] Component: Google Cloud Dataflow Runner