EigenDA x Nitro Contracts v2.1.0

Adds production support for EigenDA with Arbitrum nitro-contracts. Upstream is pinned at v2.1.0 release.

What's Changed

• fix ODA-04: Embed initialization gap by @epociask in #37

• fix(sigmap-audit): Add precursor invariants to EigenDA entrypoint by @epociask in #28

• EDAA-02 fix. by @anupsv in #29

• fix(sigmap-audit): Fix u256 casting bug by @epociask in #31

Full Changelog: v2.1.0-rc...v2.1.0