Add an option to skip verification

Currently, all blocks are always verified before importing. However, there is no need to verify the seal when all the peers are trusted nodes. In this case, skipping verification of seals can improve block sync performance.

No files or tests are named. Start by locating the block import flow and the existing seal-verification step, then determine how an option for trusted peers should be configured and applied. Done means imports can explicitly skip seal verification while retaining the current verification behavior by default.

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