Advanced mempool and contract workloads

[parthshah1]

Currently, we do only basic spam, and invalid messages to mempool to assert that bad messages never go out of mempool and are pruned successfully for both lotus and forest.

Though, we should be doing more advanced testing regarding economics of messages.
So of the ideas are:

1. Reach block limit on gas for few epochs and assert basefee increase on the network and asserting after a few epochs that basefee becomes normal.
2. Message inclusion logic, asserting under load, higher gas premium messages are included over low gas premium messages.
3. New tests will be added once more context from implementation teams.

[parthshah1]

Adding these workload drivers.
DoSpam: Sends random FIL transfers between pre-funded wallets via randomly chosen nodes
DoGasWar: Pushes a low-premium tx then races a same-nonce high-premium replacement to test mempool eviction
DoAdversarial: Fires double-spends, forged signatures, and nonce-race attacks across multiple nodes
DoHeavyCompute: Re-executes StateCompute for a recent epoch and asserts the resulting state root matches the chain
DoDeployContracts: Deploys a random EVM contract (recursive, delegatecall, simplecoin, selfdestruct, extrecursive) via EAM
DoContractCall: Invokes a previously deployed contract with its matching calldata (deep recursion, token send, etc.)
DoSelfDestructCycle: Deploys a selfdestruct contract, immediately destroys it, then verifies state cleanup across nodes
DoConflictingContractCalls: Sends the same-nonce contract invocation to two different nodes simultaneously to test conflict resolution
DoGasGuzzler: Deploys and calls burnGas(N) — tight keccak256 loop pushing block gas limits
DoLogBlaster: Deploys and calls blastLogs(N) — emits N events per tx to stress receipt/bloom/indexing
DoMemoryBomb: Deploys and calls expandMemory(N) — allocates N words of EVM memory (quadratic gas cost)
DoStorageSpam: Deploys and calls spamSlots(N) — writes N unique storage slots per tx to bloat the state tree
DoReorgChaos: Partitions a node, lets the network mine ahead, reconnects, and asserts convergence after reorg