feat(Keys_Outgoing): Decrypt note using outgoing and incoming

[LHerskind]

To fully learn of the note that we sent, we need to decrypt the outgoing and the incoming ciphertexts.

Secondly, we should likely keep track of this separately to other notes, since we are not able to spend these notes but can use them to lookup what we did. E.g., if I send funds to Mike, I can only learn about this if I either remember it or store some data, this is that data.

[LHerskind]

Likely go back to the #5901 where we follow Mikes preference of doing a single log that contains all the chunks.