Gas Efficiency: EOAMultisend

[bh2smith]

For gas savings we encode the bytes of the call array in the original batcher off chain and fallback on the existing MutlsendCallOnly contract from safe-global.

Note that this contract inherits multisend rather than calling out to it.

Vague Gas Improvements shown here (looks like about 20%)

We also removed the events (should we consider adding one?)

Ran 4 tests for test/EOAMultisend.t.sol:EOAMultisendTest
[PASS] testDirectExecution() (gas: 94564)
[PASS] testReplayAttack() (gas: 96829)
[PASS] testSponsoredExecution() (gas: 89368)
[PASS] testWrongSignature() (gas: 54673)
Suite result: ok. 4 passed; 0 failed; 0 skipped; finished in 1.51ms (3.07ms CPU time)

Ran 4 tests for test/BatchCallAndSponsor.t.sol:BatchCallAndSponsorTest
[PASS] testDirectExecution() (gas: 133489)
[PASS] testReplayAttack() (gas: 112419)
[PASS] testSponsoredExecution() (gas: 105515)
[PASS] testWrongSignature() (gas: 37856)
Suite result: ok. 4 passed; 0 failed; 0 skipped; finished in 1.53ms (3.24ms CPU time)