Add 3d energy density sensor

### 📝 Description of the feature

support 3d energy density

### 💡 Steps for implementing the feature

for this to be implemented sensor v2 needs to be supported

1. check 0.17.0 ansys-api-Speos to understand gRPC api and proto files
2. create new kernel based api helper if necessary
3. Create new class in sensor.py
4. make sure all proto fields are exposed through new api
5. create unit test for both creation and loaded features

### 🔗 Useful links and references

_No response_

Start by reviewing the 0.17.0 ansys-api-Speos gRPC API and its proto files to understand sensor v2, then inspect sensor.py and determine whether a kernel-based API helper is needed. Add the new sensor class, expose all proto fields, and add unit tests covering creation and loaded features; done means those tests pass.

Written by the indexing model from the issue text.