Implementation of filters

[vdjagilev]

As outlined in #152 it would be nice to have some kind of a filtering system that would allow you to filter out certain records from the output. One of the approaches how it can be achieved would be:

• Implement filtering options for 'cli'
  • This can be something like --filter-[entity] [filter-value]
  • Or this can be something like that: --filter [entity] [value]
• Create filtering system that would filter all the records before going to the output
• Potential solution: https://github.com/expr-lang/expr