graphql: test cases for withdrawals

[s1na]

This PR adds test cases for withdrawals (schema: ethereum/execution-apis#400) as well as the general structure of blocks and type 2 txes. I took the existing PoW chain and extended it by one Shanghai block using this script: https://github.com/s1na/graphqltestgen.

[s1na]

Besu is failing to import the new block I generated. With Bonsai flag enabled it complains world state root mismatch, without that flag:

[f81057d3] 2023-04-26 16:30:32.402+00:00 | main | INFO  | BesuControllerBuilder | TTD difficulty is present, creating initial sync for PoS
[f81057d3] 2023-04-26 16:30:32.449+00:00 | main | INFO  | TransitionBesuControllerBuilder | TTD present, creating DefaultSynchronizer that stops propagating after finalization
[f81057d3] 2023-04-26 16:30:32.486+00:00 | main | INFO  | BlocksSubCommand | Importing from /chain.rlp
[5952d45b] 2023/04/26 16:30:32 checking address: 172.17.0.4:8545
[5952d45b] 2023/04/26 16:30:33 checking address: 172.17.0.4:8545
[f81057d3] 2023-04-26 16:30:34.644+00:00 | pool-10-thread-1 | WARN  | WithdrawalsValidator$AllowedWithdrawals | withdrawals must not be null when Withdrawals are activated
[f81057d3] 2023-04-26 16:30:34.649+00:00 | pool-10-thread-1 | INFO  | MainnetBlockValidator | Invalid block 33 (0x30e688f50392780a71899dcb4c35997f5c1d168cf90306d8e6919ea805097810)
[f81057d3] java.util.concurrent.CompletionException: java.lang.IllegalStateException: Invalid block at block number 33.
[f81057d3] 2023-04-26 16:30:34.683+00:00 | main | INFO  | Besu | Using jemalloc
EROR[04-26|18:30:34] API: could not start client              client=besu container=f81057d3 error="terminated unexpectedly"

[s1na]

Besu is failing to import the new block I generated.

This is fixed now. Now pending spec being merged.

[s1na]

@fjl PTAL