Add husky pre-commit hook

[JeffGreiner-eaton]

Fixes BLUI-6037.

Changes proposed in this Pull Request:

• added husky with pre-commit
• set jest config to include coverage thresholds
• pre-commit will run cd ./components && yarn && yarn prettier:check && yarn lint && yarn coverage

Screenshots / Screen Recording (if applicable)

rn-husky-hook.mov

To Test:

• clone fresh copy git clone https://github.com/etn-ccis/blui-react-native-component-library.git
• git checkout feature/blui-6037-husky-pre-commit-hook
• run yarn install:components
• make a change somewhere to generate change set (readme)
• depending on your normal commits

a.) use the vs code source control panel to stage and commit.
(the husky pre-commit runs in the background and when complete your commit will compete)

OR

b.) use the terminal git add . && git commit -m 'my commit' (running in terminal will display what pre-commit runs)

Next test

• edit the jest.config file in components directory and update line 14 to be "lines": 76
• make additional change in readme
• repeat step (a) from above and when vs code modal opens select open git log.

OR

• repeat step (b) from above and view output

Any specific feedback you are looking for?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.46%. Comparing base (3e615ae) to head (2799da7).
Report is 3 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev     #625   +/-   ##
=======================================
  Coverage   70.46%   70.46%           
=======================================
  Files          67       67           
  Lines        1236     1236           
  Branches      183      183           
=======================================
  Hits          871      871           
  Misses        337      337           
  Partials       28       28           

Flag	Coverage Δ
unittests	70.46% <ø> (ø)

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