🔎 Remove trusted multicall forwarder

[JaredBorders]

Response to External Guhu Audit

Audit: https://gist.github.com/guhu95/d1214b942ef0dfd5672f3a3167a231d1

On-going Response: https://gist.github.com/JaredBorders/5611450065734074ee6a7add8332df7b

Issues Remedied

1. [C-01] Incorrect Handling of allowFailure in aggregate3Value Traps ETH
2. [H-03] Testing Coverage Gaps
3. [M-01] Arbitrary Destination Calls Allow Exploiting or Griefing the Relayer
4. [M-04] Trusted Forwarder Cannot Be Revoked
5. M-06] aggregate3Value Lack of Refund Traps ETH
6. [M-07] aggregate3Value Allows Draining Contract ETH Balance
7. [M-08] Aggregated Forwarding Allows Dangerous Arbitrary Calls
8. [L-02] Unnecessary payable Attribute in aggregate3 Traps ETH
9. [L-10] executeBatch Allows Gas Griefing the Relayer

[tommyrharper]

LGTM 👍

[codecov]

Codecov Report

Attention: 31 lines in your changes are missing coverage. Please review.

Comparison is base (7855bca) 81.14% compared to head (ee7b210) 63.25%.

Files	Patch %	Lines
src/libraries/SignatureCheckerLib.sol	0.00%	28 Missing ⚠️
src/Engine.sol	78.57%	0 Missing and 3 partials ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #23       +/-   ##
===========================================
- Coverage   81.14%   63.25%   -17.89%     
===========================================
  Files           6        6               
  Lines         228      166       -62     
  Branches       39       35        -4     
===========================================
- Hits          185      105       -80     
- Misses         32       55       +23     
+ Partials       11        6        -5     

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