[Feature Request]: Support interleaved embeddings of None

### Describe the problem

We don't currently support adding data where some of the embeddings are values and some are None. This could be valid, say I have brought in embeddings for some of my records from somewhere else.

### Describe the proposed solution

Allow add with some populated and some unpopulated fields

### Alternatives considered

_No response_

### Importance

nice to have

### Additional Information

Doesn't seem super important