add support for non-mainnet presets

[pk910]

Add support for non-mainnet presets by using dynamic-ssz for marshalling, unmarshalling & hashtreeroot calculation.

eg. minimal:

kurtosis config:

participants_matrix:
  el:
    - el_type: geth
      el_image: ethereum/client-go:latest
    - el_type: reth
      el_image: ghcr.io/paradigmxyz/reth:latest
  cl:
    - cl_type: lighthouse
      cl_image: sigp/lighthouse:latest
      cl_log_level: debug
    - cl_type: teku
      cl_image: consensys/teku:latest
network_params:
  preset: minimal
  electra_fork_epoch: 1
  num_validator_keys_per_node: 25
additional_services:
  - dora
  - spamoor
  - checkpointz

checkpointz_params:
  image: "pk910/dev-images:checkpointz-minimal"

kurtosis run github.com/ethpandaops/ethereum-package@pk910/checkpointz-custom-preset --args-file ./kurtosis-config.yaml

[pk910]

I've added the checkpointz.custom_preset setting to the config which defaults to false for regular mainnet setups.
For minimal preset or other custom networks this needs to be enabled to make checkpointz run properly.
Mainnet presets are still supported with custom_preset enabled, but there might be a minor performance degradation due to the reflection based codepaths.