Add bls1238 first wallet address for display and key signing

[BrandtH22]

The carbon cats which are retired per our recent blog use the first wallet address encoded with a bls1238 prefix for signing. Currently this address can only be derived from the cli or by using the climate wallet.

This request is two-fold:

1. provide the bls1238 derivation on the view keys screen in the GUI as shown here
2. add this keyset as an option for signing in the sign message advanced settings as shown here

To get the same keyset used by the climate wallet one needs to run chia keys derive -f <FINGERPRINT> wallet-address -x bls1238 -i 0
NOTE - the fingerprint must be specified in this command or an assertion error will occur.