dencun-devnet-8 specs

4844 requires a trusted setup file, Please ensure that there is a way for us to specify the file through a runtime flag such as --trusted-setup-file (or similar). If the file is baked in during compile, please ensure that the flag would indeed override the file. This is a MUST requirement for devnet 8. If your client does not support the override, we can't include it in the devnet.

DEPRECATION WARNING: Starting from dencun-devnet-9 we will be starting from Capella at epoch 0. Please make sure your client is able to handle genesis time == shanghai time, and capella_fork_epoch = 0.