CRS should fetch only what is needed

[phated]

Problem

Currently, the backend fetches the entirety of transcript00, no less. This is a huge download for small circuits.

Proposed solution

Instead of fetching all of transcript00, we should instead fetch only the amount of the G1 that is needed for a given circuit.

Alternatives considered

No response

Additional context

This is being done in combination with #139

Submission Checklist

• Once I hit submit, I will assign this issue to the Project Board with the appropriate tags.

[phated]

Splitting this into 2 issues, one for fetching the range and one for fetching more than transcript00