Draft: Support for memoless transactions

Fixes #1569

This feature adds support for a memoless transaction.

Code Walkthrough https://youtu.be/-MHBC7yPWU4

• Add lookup reference via txn hash
• Add API endpoint
• Add Integration Test
• Add new memo type and parsing
• Add genesis export/import (non-expired only)
• Add Mimir to enable/disable this feature
• Modify Bifrost to observe a memoless transaction