create DateData class

[noviluni]

This was motivated by this comment: #729 (comment)

Changing from returning a dict to returning an object seems a better decision, as it gives more control over the results and allows to document the API easier.

This should probably be improved by adding more docs, etc.

This is blocking:

• WIP: implement missing info #729
• wip: Adding DEBUG_INFO setting #561

[codecov]

Codecov Report

Merging #778 into master will increase coverage by 0.05%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #778      +/-   ##
==========================================
+ Coverage   98.24%   98.30%   +0.05%     
==========================================
  Files         231      231              
  Lines        2569     2590      +21     
==========================================
+ Hits         2524     2546      +22     
+ Misses         45       44       -1     

Impacted Files	Coverage Δ
dateparser/calendars/__init__.py	95.50% <100.00%> (+0.05%)	⬆️
dateparser/date.py	100.00% <100.00%> (+0.42%)	⬆️
dateparser/freshness_date_parser.py	98.09% <100.00%> (+0.01%)	⬆️
dateparser/search/search.py	99.33% <100.00%> (-0.01%)	⬇️

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[noviluni]

I removed the is_relative property as it wasn't necessary. It was only used in the search part and it could be avoided.

I changed that part and moved the undocumented ExactLanguageSearch to the private scope (_ExactLanguageSearch), as we will probably need to change some behaviors in the future and this would avoid deprecating it in the future. Of course, this breaking change will be noted in the release notes.

[noviluni]

I improved the coverage @Gallaecio, would you mind to take a look again? 🙂