feat: test framework

[TommYDeeee]

Testing framework for modules. It will be part of a yara-x testing suite that loops over specific directories for modules. Those directories will contain multiple input and output files. Input files will be in intel hex format that represents binary file. Binary files can be converted to ihex representation with intelhex library and also objcopy linux utility. This is due to we don't want to store potentially malicious binary files on git.

This framework loads ihex representation using ihex library, passes it as an input into scanner and imports dummy rule that will be used just for files to be parsed for given module. Resulting protobuf is compared with expected text representation of protobuf structure - goldenfile is used to mitigate problems if something changes in protobuf structure and is outside our scope.

Adding a test will require just to add input and output files for given module.

This PR also adds small bugfix for macho module, where trailing \0 were not deleted in string representations in resulting protobuf structure.