Layout styling fixes

[Vadko]

Description

• Added ListComponentStyleProp to provide header styles
• Moved style prop from scrollview to view that wraps items in list
• Added contentContainerStyle prop
• Renamed prop for ScrollView from style to containerStyle

Related Issues

I included props to style the component header and renamed style prop on the scrollView, due to the problems it caused when using styles for whole component for header component to containerStyle. Also, I've added contentContainerStyle and wrapper header with View to provide styles for it.

Tests

I added the following tests:

Test Suites: 1 passed, 1 total Tests: 10 passed, 10 total Snapshots: 1 passed, 1 total Time: 2.596 s

Checklist

• [x] I read the Contributor Guide and followed the process outlined there for submitting PRs.
• [x] Run yarn lint && yarn tsc
• [x] Run yarn test or yarn test -u if you need to update snapshot.
• [x] I am willing to follow-up on review comments in a timely manner.

[codecov[bot]]

Codecov Report

Merging #23 (1e79426) into master (17f7ef8) will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master       #23   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines           31        33    +2     
  Branches        11        12    +1     
=========================================
+ Hits            31        33    +2     

Flag	Coverage Δ
unittests	100.00% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
index.tsx	100.00% <100.00%> (ø)

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