Send ICP and Stake Neuron in Candid

Two more transactions we'd like to support for Candid: "Send ICP" and "Stake Neuron".

The vectors are the same for both. The difference is a byte passed when signing; therefore, not part of the test vectors.

The last three test vectors are "Stake Neuron" while the first seven are "Send ICP".

Same rendering functionality and logic as for proto transactions (if any of the below are different, reach out):

Show memo, also when it's 0.
Do not show timestamp.
To and from accounts show as hex. I have added the "to" and "from" in each test vectors to be able to compare them when developing it. Code is here.

The stake neuron vectors have hardcoded bytes to be able to reproduce the to account. Code is here.

Thanks!

Zondax / ledger-icp