Execution data tracker storage is currently stored in a BadgerV2 database. Reference.

Use pebble as the database for this storage. Split it out similarly to how we've done it for all the other storage interfaces (e.g., storage.Headers). Refactor the existing Badger storage implementation and add the Pebble version of the storage.

For example: storage.Headers

• Badger version:
  

  flow-go/storage/badger/headers.go

  Line 17 in f296f51

  type Headers struct {

• Pebble version:
  

  flow-go/storage/pebble/headers.go

  Line 16 in 233e08f

  type Headers struct {