Integrate send task from LayerZero template repo

[lgiussan]

The vfy-oft repository is based on Layer Zero native-oft-adapter template.

At the time vfy-oft was created, the template didn't include a helper task for easily bridging tokens. However this is being added in this PR, currently under review.

The current PR is a straightforward replica of the upstream PR.

N.B. In order for the send task to work out of the box, the VFlow rpc node version should be >= 1.0.1, because release 1.0.1 fixes a misconfiguration of eth_estimateGas, which makes the task itself fail.
As a workaround, it's still possible to use a rpc node at version 1.0.0, but it will be necessary to hardcode the gas limit like this

diff --git a/tasks/sendEvm.ts b/tasks/sendEvm.ts
index 1916887..a09ba9c 100644
--- a/tasks/sendEvm.ts
+++ b/tasks/sendEvm.ts
@@ -289,6 +289,7 @@ export async function sendEvm(
             )
             tx = await oft.send(sendParam, msgFee, signer.address, {
                 value: totalValue,
+                gasLimit: 1_000_000,
             })
         } else {
             tx = await oft.send(sendParam, msgFee, signer.address, {