Improve Selecting Key To Pay Fees With Prompt

[sukantoraymond]

Context and scope
We should include which token will be used for transaction fee and amount (e.g. native token, C Chain AVAX, P Chain AVAX, etc)
to make it simpler for users to know which stored key to use.

Discussion and alternatives
Include a description of the changes to be made to the code along with alternatives that were considered.

Open questions
Questions that are still being discussed.