feat!: mitigate homograph attack in DPNS

[shumkov]

Issue being fixed or feature implemented

With DPNS you can register very similar domain names that malicious actors could use in DashPay to mimic others and receive their transactions.

What was done?

• Convert normalized label and parent domain name to base58 chars so you can't register both "HOST" and "H0ST" names.
• Added parentDomainName property so we can restore the origin full domain name concatenating label + . parentDomainName.

How Has This Been Tested?

Unit tests and the test suite are updated.

Breaking Changes

The DPNS system data contract is changed so the previously created state won't be valid.

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 made corresponding changes to the documentation

For repository code-owners and collaborators only

• I have assigned this pull request to a milestone