bug: `IVariableMap.createVariable` type definition is wrong

[tana-gh]

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Description

The type definition for IVariableMap.createVariable is incorrect.
The arguments id and type are reversed.

https://github.com/google/blockly/blob/bea183d85da6465cd0511fc48f2e612b99b6c1ff/core/interfaces/i_variable_map.ts#L46

https://github.com/google/blockly/blob/bea183d85da6465cd0511fc48f2e612b99b6c1ff/core/variable_map.ts#L221

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[maribethb]

Thanks! We will update the one in the interface; the implementation in variable_map has to stay the same since that would be the breaking change.