Add YASHE key generation and full iris bit length polynomial benchmarks

[teor2345]

The YASHE key generation benchmarks stop key generation accidentally getting really slow.

The iris benchmarks provide an upper bound for the performance of iris operations. They also help us work out how our operation speed changes with increasing polynomial size, so we can decide if we need smaller or larger polynomial sizes.

This PR also fixes some method arguments so they can be used in benchmarks, and removes some redundant clones.

Close #54 Close #72

[teor2345]

Just resetting CI and hopefully the merge commit, to bring the benchmarks up to date with the latest baseline.

[teor2345]

Please merge this after reviewing it!