Implement date and time picker

[ellykits]

Closes #10 and #9
On the main form time picker and date picker views are differentiated by these icons respectively

As shown in this sample screenshot

Date picker

Time picker

[codecov]

Codecov Report

Merging #39 into master will increase coverage by 1.11%.
The diff coverage is 79.12%.

@@             Coverage Diff              @@
##             master      #39      +/-   ##
============================================
+ Coverage     74.24%   75.36%   +1.11%     
- Complexity      192      215      +23     
============================================
  Files            24       26       +2     
  Lines           532      617      +85     
  Branches         93      105      +12     
============================================
+ Hits            395      465      +70     
- Misses           53       58       +5     
- Partials         84       94      +10

Impacted Files	Coverage Δ	Complexity Δ
...java/com/nerdstone/neatformcore/utils/Constants.kt	0% <ø> (ø)	0 <0> (ø)	⬇️
...ain/java/com/nerdstone/neatformcore/utils/Utils.kt	46.15% <0%> (-13.85%)	7 <0> (ø)
...atformcore/views/builders/RadioGroupViewBuilder.kt	67.34% <0%> (-2.87%)	16 <0> (ø)
...java/com/nerdstone/neatformcore/utils/ViewUtils.kt	81.39% <100%> (+0.9%)	19 <0> (+1)	⬆️
...neatformcore/views/builders/EditTextViewBuilder.kt	64.51% <66.66%> (+3.91%)	10 <0> (ø)	⬇️
...tformcore/views/widgets/DateTimePickerNFormView.kt	76.92% <76.92%> (ø)	6 <6> (?)
...rmcore/views/builders/DateTimePickerViewBuilder.kt	86.56% <86.56%> (ø)	16 <16> (?)

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