Vtlengine

What's Changed
* Add VTL 2.1 grammar and generate new parsers by mla2001 in https://github.com/Meaningful-Data/vtlengine/pull/30
* 28 implement case operator by mla2001 in https://github.com/Meaningful-Data/vtlengine/pull/35
* 27 implement random operator only operator class by mla2001 in https://github.com/Meaningful-Data/vtlengine/pull/37
* 34 issues in rank operator by javihern98 in https://github.com/Meaningful-Data/vtlengine/pull/40
* 36 improve api errors on wrong datastructures by mla2001 in https://github.com/Meaningful-Data/vtlengine/pull/41

**Full Changelog**: https://github.com/Meaningful-Data/vtlengine/compare/v1.0.1...v1.0.2

What's Changed
* 2 improve time operators performance by mla2001 in https://github.com/Meaningful-Data/vtlengine/pull/7
* Removed Future Warnings from pd.df.fillna. by mla2001 in https://github.com/Meaningful-Data/vtlengine/pull/3
* Added flake8 and black. by mla2001 in https://github.com/Meaningful-Data/vtlengine/pull/10
* 1 enhance docstrings to use google format by albertohernandez1995 in https://github.com/Meaningful-Data/vtlengine/pull/24
* Readme update by antonio-olleros in https://github.com/Meaningful-Data/vtlengine/pull/29
* Add mypy by mla2001 in https://github.com/Meaningful-Data/vtlengine/pull/26
* Fixed non mandatory missing components not autofilled with NaN on dat… by mla2001 in https://github.com/Meaningful-Data/vtlengine/pull/32

**Full Changelog**: https://github.com/Meaningful-Data/vtlengine/commits/v1.0.1