fix: do not apply block range filter on internal tables

[Sekhmet]

This commit also refactors out applyBlockFilter helper into database utils to avoid repetition.

Closes: #301

Test plan

Run query like this:

query ($checkpointId: ID!, $metadataId: ID!) {
  spaces(block: 18407) {
    id
  }
  _checkpoints {
    id
  }
  _metadatas {
    id
  }
  _checkpoint(id: $checkpointId) {
    id
  }
  _metadata(id: $metadataId) {
    id
  }
}

It works without crashing.

[bonustrack]

utACK