Feature/character count component

[szilvihorvath]

Issue: #414

Created new CharacterCount component.

Key features:

• Developer should be able to specify the character limit number
• Developer should be able to pass in the character limit prompt message (one when JS is enabled, and another for when non-js is disabled)
• HTML structure should match GDS markup (with ability to set css classes) or the developer should be able to specify the HTML markup
• Character should count down when JS is enabled

[daniele-zurico]

Hey @szilvihorvath really well done on your PR. It's almost perfect. I had a look on the gds toolkit documentation and I found out more scenario that we should take in consideration like the following:

• it doesn't stop you writing but change the message when you over the limit (became red)

• it counts the letters (maxlength)

• it counts the words (maxwords)

• it allow a threeshold after that the message appear (maxlength: 112, threshold: 75)

• Please can you also keep an eye on the styled version (govUk)... I feel like some classes are not correctly implemented. Probably the class govuk-textarea should make the job.

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and no project coverage change

Comparison is base (cf21f21) 100.00% compared to head (2d15b2a) 100.00%.

❗ Current head 2d15b2a differs from pull request most recent head 86a1b0c. Consider uploading reports for the commit 86a1b0c to get more accurate results

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Additional details and impacted files

@@              Coverage Diff              @@
##           release/0.7      #419   +/-   ##
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  Coverage       100.00%   100.00%           
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  Files               45        46    +1     
  Lines             1029      1075   +46     
  Branches           400       428   +28     
=============================================
+ Hits              1029      1075   +46     

Impacted Files	Coverage Δ
src/characterCount/CharacterCount.tsx	100.00% <100.00%> (ø)

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