feat: identity state transition validation fixes

[QuantumExplorer]

Issue being fixed or feature implemented / What was done

This PR fixes many issues discovered in identity state transition review:

• Withdrawal keys were not being used, they are not called Transfer keys and are meant to act like authentication keys but only for withdrawals and transfer of funds.
• There was an issue where we could not insert a withdrawal/transfer key, fixed.
• Transfer keys were not searchable, now they are.
• Error codes were updated
• Some consensus errors were being returned as protocol errors allowing for attacks on the system.
• Only one master key can be active at a time, if you wish to disable one, you must add one, if you wish to add one, you must disable the current key. You can not add more than 1 at a time.
• Moved identity key proof of possession on identity update to a later part of validation. If it fails validation users will still need to pay for the processing of the state transition.

How Has This Been Tested?

Test suite is still passing, updated some strategy tests.

Breaking Changes

Multiple breaking changes.

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated relevant unit/integration/functional/e2e tests
• I have added "!" to the title and described breaking changes in the corresponding section if my code contains any
• I have made corresponding changes to the documentation if needed

For repository code-owners and collaborators only

• I have assigned this pull request to a milestone

[shumkov]

👍