FOLLOW-244: Add notifyTopUpCanister to CMC API

[dskloetd]

Motivation

Topping up a canister is a 2-step process:

1. Transfer ICP to a subaccount of the CMC
2. Notify the CMC of the transfer

Because the process might be interrupted between the 2 steps, the nns-dapp canister listens for all transactions to see if any might be a canister top-up transaction by an NNS dapp user.

We want the NNS dapp to stop listening for all transactions so we want to move this fallback mechanism to the frontend.

In this PR we add just an API function that will be needed to notify the CMC from the frontend.

Changes

1. Add notifyTopUpCanister to CMC API.

Tests

1. Unit tests added.
2. Tested manually in another branch with more changes.

Todos

• Add entry to changelog (if necessary).
  not yet

[mstrasinskis]

Thanks!