Several backend db migrations that fix the state of the chain:
- Bumping StorageVersion for pallets Balances, Scheduler, Staking
- Update to Substrate v0.9.38, which is ink4 compatible
- Setting storage per one byte of contract storage: 4*10^{-5} AZERO per byte
- Increase total memory to 256MB, decrease call stack to 16 and enforce heap pages limit at cli.
- minor improvements to the finalization network