internal writes errors handling

[ppedziwiatr]

Raised by @jakub-wojciechowski during the Dex development (https://github.com/warp-contracts/wrc/tree/dex). Currently errors have to be handled manually in the contract's code (checking the result.type from the SmartWeave.contracts.write and throwing ContractError if it is different then 'ok').

If SmartWeave.contracts.write fails, it should throw automatically by default.