refactor: remove substrate block storage

[cchudant]

Pull Request type

Please add the labels corresponding to the type of changes your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no API changes)
• Build-related changes
• Documentation content changes
• Testing
• Other (please describe):

What is the current behavior?

Resolves: #NA

What is the new behavior?

Does this introduce a breaking change?

Other information

[jbcaron]

• Database Changes:
  • Move everything related to pending into the Meta column.
  • Remove storage per chunk in db from the commit on the storage key.
  • Use two different columns for events and transactions of a block.

[antiyro]

Probably one of Deoxys biggest milestones