Fetch user crypto address by publickey

[umairkhannn]

[umairkhannn]

Adding these feature too:

1. for better performance, we should cache this info in our local keychain (if and only if we have the user in our keychain), and look for that info before sending a request to the node to check the database

2. for practical use, let's integrate it into the withdrawal overlay so that if I go through the user menu, send SAITO, I want it to (a) give a list of cryptos you use, and (b) automatically plug in your receiving addresses when I select different cryptos to send you

[umairkhannn]

Some changes suggested by dan:

• make crypto_addresses as object instead of array
• keep ticker instead of asset_id in object
• disable amount input if available balance is less than fee

And fix:

• showing 'undefined' when changing to 'trx' from dropdown in withdraw overlay of "send saito"

[umairkhannn]

Fixes and suggestions done and changes pushed to branch: crypto/fetch-user-data