Bug/bal still loading

[numdinkushi]

Description @bayological

Key changes

1. I added a 'isFetchingBalance' from the store to keep track of the wallet balance state, if fetched or not
2. I added a ref to the form so as to trigger the submit button when 'balance is still loading' is rendered so it automatically changes (with the help of the useEffect)
3. Instead of the lastUpdated props, i used the isFetchingBalance props in the useFormValidator hook like so:
   if (isFetchingBalance) return { fromTokenId: 'Balance still loading' };

Other changes

using the isFetchingBalance props, i render 'Retrieving balance' on the button.
Describe any minor or "drive-by" changes here.

Tested

An explanation of how the changes were tested or an explanation as to why they don't need to be.

Related issues

• Fixes #issue number here

Checklist before requesting a review

• • I have performed a self-review of my own code
• I have added tests that prove my fix is effective or that my feature works
• The PR title follows the conventions
• I have run the regression tests

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