Provider nonce handling

[alexcos20]

We have mixed flow of how nonce is used when sending requests to provider.

Some functions are calling getNonce, others are just sending Date.now().

Proposal:

• for all requests, call getNonce()
• increase it by 1
• use the new nonce to sign

[calina-c]

@alexcos20 is this a duplicate of #1452 (closed last week)?