[Cashtab] [Alias] - Alias address preview upon valid input

Summary:
T2989

Upon input of a valid alias in send xec and send token components, the parsed address is displayed beneath the address input as a preview for the user for verification purposes.

Test Plan:

• navigate to Send, input a valid alias and ensure the address preview message is displayed This alias resolves to...
• add one extra character to invalidate the alias input and ensure the address preview is cleared and Invalid address is displayed
• remove the one extra character from above and ensure address preview is displayed again
• replace the alias input with a valid ecash address and ensure no address preview nor error is displayed
• use an invalid ecash address and ensure Invalid address is displayed
• enter a valid alias and send a normal XEC transaction. Ensure upon successful broadcast the address preview message is cleared
• repeat the above for sendToken

Reviewers: bytesofman, #bitcoin_abc

Reviewed By: bytesofman, #bitcoin_abc

Differential Revision: https://reviews.bitcoinabc.org/D13295