Upgrade wallet bridge API schemas

Michał Kudelarequested to merge
kudmich/wba into master

In this MR:

  • Update the oldest schemas - wallet_bridge API, more precise scehmas were used,
  • Price schema changed - validates values (Hive:HBD or HBD:Hive). legacy_format parameter can be specified to validate legacy format,
  • Add custom schema FloatAsString, HbdExchangeRate and Sha256.

Corresponding merge request in Hive: hive!752 (merged)

Edited by Michał Kudela

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