Add hex code field and shades in color picker

[AhsanSarwar45]

Closes #31

[codecov]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (8d6ffdd) 29.13% compared to head (f894433) 31.58%.

❗ Current head f894433 differs from pull request most recent head c0ecbc7. Consider uploading reports for the commit c0ecbc7 to get more accurate results

Files	Patch %	Lines
lib/common/widgets/fields/color_bottom_sheet.dart	0.00%	6 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #41      +/-   ##
===========================================
+ Coverage    29.13%   31.58%   +2.44%     
===========================================
  Files          205      201       -4     
  Lines         8545     7883     -662     
===========================================
  Hits          2490     2490              
+ Misses        6055     5393     -662     

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