App abstraction (go changes) (#2349)

* Update `generate.go`

* Regenerate `sin-executor`

* Update Example App references

* Use non-zero period in tests

* Use `GetMessageFee` for setting the message value

* Use non-zero gas airdrop amount in tests

sin-executor/contracts/mocks/executionfeesmock/generate.go

@@ -1,3 +1,3 @@
 package executionfeesmock
 
-//go:generate go run github.com/synapsecns/sanguine/tools/abigen generate --sol ../../../../packages/contracts-communication/flattened/ExecutionfeesMock.sol --pkg executionfeesmock --sol-version 0.8.20 --filename executionfeesmock --evm-version istanbul
+//go:generate go run github.com/synapsecns/sanguine/tools/abigen generate --sol ../../../../packages/contracts-communication/flattened/ExecutionFeesMock.sol --pkg executionfeesmock --sol-version 0.8.20 --filename executionfeesmock --evm-version istanbul

sin-executor/contracts/mocks/interchainapp/generate.go

@@ -1,3 +1,3 @@
 package interchainapp
 
-//go:generate go run github.com/synapsecns/sanguine/tools/abigen generate --sol ../../../../packages/contracts-communication/flattened/InterchainAppExample.sol --pkg interchainapp --sol-version 0.8.20 --filename interchainapp --evm-version istanbul
+//go:generate go run github.com/synapsecns/sanguine/tools/abigen generate --sol ../../../../packages/contracts-communication/flattened/ExampleAppV1.sol --pkg interchainapp --sol-version 0.8.20 --filename interchainapp --evm-version istanbul

sin-executor/contracts/mocks/interchainapp/helpers.go

@@ -10,7 +10,7 @@ import (
 
 // InterchainAppMockRef is a reference to an interchain db.
 type InterchainAppMockRef struct {
-	*InterchainAppExample
+	*ExampleAppV1
 	// address of the interchain client
 	address common.Address
 }
@@ -22,13 +22,13 @@ func (i *InterchainAppMockRef) Address() common.Address {
 
 // NewInterchainAppRef creates a new interchain client with a contract ref.
 func NewInterchainAppRef(address common.Address, backend bind.ContractBackend) (*InterchainAppMockRef, error) {
-	instance, err := NewInterchainAppExample(address, backend)
+	instance, err := NewExampleAppV1(address, backend)
 	if err != nil {
 		return nil, fmt.Errorf("could not create instance of InterchainClient: %w", err)
 	}
 	return &InterchainAppMockRef{
-		InterchainAppExample: instance,
-		address:              address,
+		ExampleAppV1: instance,
+		address:      address,
 	}, nil
 }