Inspection to report `toString()` in verification

[picimako]

Summary

Based on Mockito error handling, Mockito cannot verify the toString() method.

Tasks

• Create an inspection that can report verification of toString()
• Include all approaches from Mockito, BDDMockito and InOrder
• Check if/how MockedStatic is affected in this case.

[picimako]

Completed in v0.7.0.