Move exhaustive tests for recovery to module
Summary:
This is a parital backport of secp256k1 PR808 : https://github.com/bitcoin-core/secp256k1/pull/808/commits/c498366e5b2d9c60e2e677949cf7373dbe877515
Depends on D7654
Test Plan:
ninja check-secp256k1
Reviewers: #bitcoin_abc, Fabien
Reviewed By: #bitcoin_abc, Fabien
Differential Revision: https://reviews.bitcoinabc.org/D7655