Transfer Form. Improve mosaic amount input

[OlegMakarenko]

• Display mosaic balance in the amount text box
• Display an error message when the transfer amount exceeds the balance

[coiki]

User Story

As a user that wants to send mosaics,
I want to be warned when I want to send more mosaics than I currently hold,
so I can make adjustments when needed.

Acceptance Criteria

AC1. We will show a non-intrusive validation alert when the amount typed in the box, is higher than the current available balance.
AC2. We will not block the action of attempting to send, and will wait to receive a REST error if the user wants to send a higher amount. This is to avoid issues with source of truth.

This task comes from an Out of scope from #1530.

[cryptoBeliever]

The only problem I've found is that currently we are blocking "Send" button when the amount is too big which is not correct according AC2 (#1562 (comment))

[cryptoBeliever]

Currently validation is still on wallet side: https://share.getcloudapp.com/jku4GXyk

[cryptoBeliever]

@bassemmagdy
There is also small issue in offline txs (it does not allow to create offline tx):

[cryptoBeliever]

Looks good in PR #1745 👍