feat: Set swap executors and verifiers

- Moved the deployment method into a test template for organization
- Created skeletons of dispatcher contracts
- Added all possible test cases for thoroughness

foundry/src/CallbackVerificationDispatcher.sol

@@ -0,0 +1,17 @@
+// SPDX-License-Identifier: UNLICENSED
+pragma solidity ^0.8.0;
+
+/**
+ * @title Dispatch callback verification to external contracts
+ * @author PropellerHeads Devs
+ * @dev Provides the ability to delegate callback verification to external
+ *  contracts. This allows dynamically adding new supported protocols
+ *  without needing to upgrade any contracts. External contracts will
+ *  be called using delegatecall so they can share state with the main
+ *  contract if needed.
+ *
+ *  Note Verifier contracts need to implement the ICallbackVerifier interface
+ */
+contract CallbackVerificationDispatcher {
+    mapping(address => bool) public callbackVerifiers;
+}