test: snapshot tests for `storage_types` contract dryrun results

[peetzweg]

adds snapshot testing of the dryrun results of the functions from the "storage_types" contract. Contract source can be found here: https://github.com/paritytech/ink/pull/1762

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[peetzweg]

The decoded values for Option<Some> and Option<None> look wrong to me, wdyt @statictype ?

https://github.com/paritytech/contracts-ui/pull/470/files#diff-5558a07e3fdf5db8ec5334fb5ab01576ce619c6b3e6094da25966fe1f2d5e04cR22-R27

[statictype]

The decoded values for Option and Option look wrong to me, wdyt @statictype

It's correct actually, the Option returns nothing in the Some branch

[peetzweg]

The decoded values for Option and Option look wrong to me, wdyt @statictype

It's correct actually, the Option returns nothing in the Some branch

Ah true, I forgot to return something else than the unit value. I adapted the contract and updated this branch. Will return a bool for Ok Result and Some Option.

Furthermore I removed the code related to the Mapping type. Afaik an ink message is not able to return a whole mapping only individual values or an array.

https://github.com/paritytech/ink/pull/1762#commits-pushed-c35b47a