duration_field 8.x-2.0-rc3

Release addresses following issues:

#3129815: Rename GranularityStringdata to GranularityStringData to match code standards by dww, ilgnerfagundes: Rename GranularityStringdata to GranularityStringData to match code standards
#3020676: Support the #date_increment property in the 'duration' form element. by dww: Support the #date_increment property in the 'duration' form element
#3131213: t() calls should be avoided in classes by mo_farhaz, dww: t() calls should be avoided in classes
#3129783: Fix coding standards bugs by dww: Fix coding standards bugs
#3067412: Remove stray autoload entry in composer.json by kavbiswa, shubham.prakash, joachim, dww: Remove stray autoload entry in composer.json
#3091695: Remove deprecated code and declare Drupal 9 compatibility by dww, Sergiu Stici, ankushgautam76@gmail.com, heddn, abhisekmazumdar: Remove deprecated code and declare Drupal 9 compatibility
#3093354: Don't use deprecated drupal_process_states() if FormHelper::processStates() exists by dww: Follow-up to use // not /// for better code standards compliance.
#3093354: Don't use deprecated drupal_process_states() if FormHelper::processStates() exists by dww: Don't use deprecated drupal_process_states() if FormHelper::processStates() exists
#3093358: Enable automated testing for duration_field project by dww: Enable automated testing for duration_field project: