✨ Runtime Precompute Buffers

### Is there an existing issue for this?

- [X] I have searched the existing issues

### Suggestion

Precompute Buffers should be scoped to an election public key and we should be able to have more than one in memnory at a time. They should also probably be initialized by a context-containing element (instaed of a stagic singleton isntance). the encryption mediator seems like a good place for that. Alsoi we need to do some api cleanup to make working with the precompute buffers easier. either we need overrides of the encrypt and other functions that allow passing in a handle to the buffer lookups, or perhaps something else. There's some discussion around this in PR #214

### Possible Implementation

_No response_

### Anything else?

_No response_