Hide open indicator on API error; Move opening hours code into feature (Clean Architecture); Use dartz package for Either class

[fremartini]

closes #393

[codecov[bot]]

Codecov Report

Merging #394 (f70d7ff) into develop (2ee3c26) will increase coverage by 0.82%. The diff coverage is 67.16%.

@@             Coverage Diff             @@
##           develop     #394      +/-   ##
===========================================
+ Coverage    47.34%   48.16%   +0.82%     
===========================================
  Files           79       87       +8     
  Lines         1411     1472      +61     
===========================================
+ Hits           668      709      +41     
- Misses         743      763      +20     

Flag	Coverage Δ
unittests	48.16% <67.16%> (+0.82%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
lib/core/usecases/usecase.dart	0.00% <0.00%> (ø)
.../repositories/external/contributor_repository.dart	0.00% <ø> (ø)
...b/data/repositories/shared/account_repository.dart	16.66% <ø> (ø)
lib/data/repositories/utils/executor.dart	50.00% <ø> (-3.85%)	:arrow_down:
...ib/data/repositories/v1/occupation_repository.dart	0.00% <ø> (ø)
lib/data/repositories/v1/product_repository.dart	0.00% <ø> (ø)
lib/data/repositories/v1/receipt_repository.dart	0.00% <0.00%> (ø)
lib/data/repositories/v1/ticket_repository.dart	41.66% <ø> (ø)
lib/data/repositories/v1/voucher_repository.dart	0.00% <ø> (ø)
...ib/data/repositories/v2/app_config_repository.dart	0.00% <ø> (ø)
... and 23 more

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