all: Integrate snapshot database to pathdb

[fynnss]

Description

integrate snapshot into pathdb

target

• Delete snapshot database & only keep trie node database
• Keep nearly the same or better performance
  • Read account&storage from trie database during block execution
  • Keep the same behavior during block validation
  • Keep nearly the same behavior during block commit(only some change to trie node commit)

Rationale

Example

Changes

Notable changes:

• add each change in a bullet point here
• ...