Remove client tags and add more tests for parsing

[tankangliang]

Description

Removed tags field from Client

Fixes #248
Related: #230

Testing

All tests are passing as usual.

Updated test to reflect changes to country commands and a little bit of standardization in format.

[codecov]

Codecov Report

Merging #249 into master will decrease coverage by 0.07%.
The diff coverage is 87.50%.

@@             Coverage Diff              @@
##             master     #249      +/-   ##
============================================
- Coverage     84.44%   84.37%   -0.08%     
+ Complexity      864      851      -13     
============================================
  Files           110      110              
  Lines          2372     2310      -62     
  Branches        263      253      -10     
============================================
- Hits           2003     1949      -54     
+ Misses          280      276       -4     
+ Partials         89       85       -4     

Impacted Files	Coverage Δ	Complexity Δ
...seedu/address/logic/commands/ClientAddCommand.java	100.00% <ø> (ø)	8.00 <0.00> (ø)
...u/address/logic/parser/ClientAddCommandParser.java	100.00% <ø> (ø)	6.00 <0.00> (ø)
.../address/logic/parser/ClientEditCommandParser.java	100.00% <ø> (+6.25%)	10.00 <0.00> (-4.00)	⬆️
src/main/java/seedu/address/model/AddressBook.java	86.36% <ø> (-3.30%)	20.00 <0.00> (-3.00)
.../java/seedu/address/model/util/SampleDataUtil.java	92.30% <ø> (-3.15%)	7.00 <0.00> (-1.00)
...seedu/address/model/widget/WidgetModelManager.java	46.34% <ø> (-5.84%)	6.00 <0.00> (ø)
src/main/java/seedu/address/ui/ClientListCard.java	95.45% <ø> (-0.55%)	6.00 <0.00> (-2.00)
...eedu/address/logic/commands/ClientEditCommand.java	93.82% <50.00%> (-0.43%)	12.00 <0.00> (ø)
...c/main/java/seedu/address/model/client/Client.java	98.36% <100.00%> (-0.22%)	30.00 <1.00> (-3.00)
.../java/seedu/address/storage/JsonAdaptedClient.java	100.00% <100.00%> (ø)	20.00 <0.00> (-1.00)
... and 5 more

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[qwoprocks]

minor issues, other than that LGTM, also there's a tagged field left in duplicateClientAddressBook.json