#18 Use json_serializable instead of current solution

[OlegNovosad]

• [x] Add dependencies
• [x] Rework to use generated parts and json serializable

Resolved #18

[codecov[bot]]

Codecov Report

Merging #22 (d7381dd) into release/0.3.0 (cff5498) will decrease coverage by 5.04%. The diff coverage is 56.25%.

@@                Coverage Diff                @@
##           release/0.3.0      #22      +/-   ##
=================================================
- Coverage          80.81%   75.77%   -5.05%     
=================================================
  Files                 41       40       -1     
  Lines                344      194     -150     
=================================================
- Hits                 278      147     -131     
+ Misses                66       47      -19     

Impacted Files	Coverage Δ
lib/src/models/location/category/service_type.dart	0.00% <0.00%> (ø)
lib/src/models/location/hours/more_hours.dart	0.00% <0.00%> (ø)
...ocation/metadata/ad_words_location_extensions.dart	0.00% <0.00%> (ø)
...rc/models/location/metadata/relationship_data.dart	0.00% <0.00%> (ø)
...src/models/location/service_area/point_radius.dart	0.00% <0.00%> (ø)
lib/src/models/error.dart	66.66% <50.00%> (-33.34%)	:arrow_down:
lib/src/models/location/common/date.dart	66.66% <50.00%> (-13.34%)	:arrow_down:
lib/src/models/location/price_list/item.dart	66.66% <50.00%> (-20.84%)	:arrow_down:
lib/src/models/location/price_list/label.dart	66.66% <50.00%> (-13.34%)	:arrow_down:
lib/src/models/location/price_list/money.dart	66.66% <50.00%> (-13.34%)	:arrow_down:
... and 31 more

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