[HyperNova] Make tests generic w.r.t. curve and field

[oskarth]

Problem

We want tests to be generic, so we can test against different curves etc more easily.

We also don't want to introduce "regressions" w.r.t. code style for HyperNova work.

Context

From upstream PR review:

There were recent PRs (e.g., microsoft#171, microsoft#165) to make tests generic over the curves. I wonder if it makes sense to continue that approach to allow library users to switch curves and still run these tests more easily.

Originally posted by @srinathsetty in microsoft#175 (comment)

Acceptance criteria

All newly introduced tests (w.r.t. upstream) are generic w.r.t. F or G.

[oskarth]

Partially done here #31

Once approach seems OK can do for rest of tests

[oskarth]

Done above.