* support for arbitrary arity for F

* revive MinRoot example

* revive tests

* revive ecdsa

* remove unused code

* use None instead of Some(1u32)

* revive benches

* fix clippy warning

* ecdsa signature proof

* use the library-provided default circuit

* small reorg

Co-authored-by: Srinath Setty <srinath@microsoft.com>