Add negative tests for host integration

[pepyakin]

For example, test what if:

• ImportResolver returned a signature that incompatible from requested,
• Externals::invoke_index returned a value when no value expected by the signature, and vice versa

[Robbepop]

This issue is no longer relevant since it is based on legacy wasmi that we no longer support. The current wasmi version has vastly differnt API with respect to the discussed topic.