L1, L2 (dev): Add support for Pectra engine API methods in `EngineClient`

[ilitteri]

Currently, the EngineClient does not support the Pectra engine API methods. This causes the dev L1 and the L2 block producer to fail since the timestamp used for block production is post-Pectra.

A temporary solution for doing these work (L1 dev and L2 block producer) is:

1. To remove pectraTime from L2 genesis.
2. To create a genesis file for L1 dev without pectraTime.