Prevent blob transaction for inclusion

[julien-marchand]

Description

Prevent mining L2 transactions carrying blobs once Linea moves to Prague. We need to prevent type 3 transactions for inclusion:

• During block building (to avoid mining them)
• During block import (so that if a misbehaving sequencer includes it, it gets rejected by other validators)
• In the transaction pool as well (to avoid saturating the transaction pools)

Motivation

Linea doesn't plan to support or prove blobs on the L2.

Tasks

• Extend the https://github.com/Consensys/linea-sequencer to:
  • Drop type 3 transaction during block building
  • Consider a block invalid if it contains type 3 transaction during block import
  • Drop type 3 transactions, in the transaction pool

[fab-10]

All 3 requirements can be achieved, at once, implementing a plugin based on this API hyperledger/besu#8365