Rework estimated time

[davidbeig]

This PR will do a rework so that there is an estimated time for ever activity and that it can be translated into accountability when exported.

[codecov]

Codecov Report

Merging #7 into master will decrease coverage by 0.28%.
The diff coverage is 40.00%.

@@            Coverage Diff             @@
##           master       #7      +/-   ##
==========================================
- Coverage   61.01%   60.73%   -0.29%     
==========================================
  Files          46       46              
  Lines         867      871       +4     
==========================================
  Hits          529      529              
- Misses        338      342       +4     

Impacted Files	Coverage Δ
...ands/decidim/time_tracker/admin/create_activity.rb	92.30% <ø> (-7.70%)	⬇️
.../decidim/time_tracker/admin/export_time_tracker.rb	0.00% <0.00%> (ø)
...ands/decidim/time_tracker/admin/update_activity.rb	93.75% <ø> (-6.25%)	⬇️
.../forms/decidim/time_tracker/admin/activity_form.rb	100.00% <100.00%> (ø)
...ecidim/time_tracker/admin/activities_controller.rb	87.23% <0.00%> (ø)

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[verarojman]

Superseded by #15