Set the default PolkaVM stack and heap size values to 128KB. #441
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Fixes paritytech/contract-issues#149
A few test cases from v2-periphery-polkadot are hitting the PVM stack limit when the contracts are compiled using resolc version 0.5.0. The same tests pass if the contracts are compiled with a resolc version that includes commit: 878ca91.
After a brief discussion with @xermicus, we propose to set the default PolkaVM stack and heap size values to 128KB, since we have already encountered tests that hit the stack size limit and, without real world data, it is difficult to determine the optimal values.