add syscalls

[0x0ece]

Do NOT merge, this is just a demo / wip.

This PR shows a path to run syscalls conformance tests using firedancer and solfuzz-agave.

1. generators/syscalls_hash.py creates 3 tests for sha256, keccak256, blake3 (empty input => expect valid + correct output)
2. vm.proto is taken from solfuzz-agave => we prob want a better way to keep all protos together, e.g. proto/ folder?
3. test_suite has been hacked so that it can run SyscallContext instead of InstrContext and return SyscallEffect.
   • instead of duplicating all functions, a much better approach is probably to handle instr/syscall depending on the type
   • I don't want to create too much mess, so I leave architecture decision + refactor to someone else, this is just an example to see that it can work