Improve wallet import screen

[stepansnigirev]

At the moment we just print the whole descriptor to the label. But we check that we are included in the wallet. If we use this function to also highlight our key in the descriptor it would help the user visually recognize which key is where. Note we can use .recolor method from lvgl

Also makes sense to represent descriptor itself in a better form - like:

2 of 3 multisignature wallet
Type: native segwit
Cosigners:
xpubA
xpubB - mine
xpubC