Improve getAccountsByAuth

[zxcat]

To make it more compatible with EOS LightAPI the following should be implemented:

• add public_key field to result when return keys (pubkey is legacy)
• accept input key in PUB_K1 format
• LightAPI returns all permissions of an account, which key matches request
• fetch recursive: if key found in acc1, then we should also fetch accounts with auth.accounts.includes(acc1)