fix: use pascalCase Slice type for <SliceZone> resolver

[angeloashmore]

Types of changes

• Chore (a non-breaking change which is related to package maintenance)
• Bug fix (a non-breaking change which fixes an issue)
• New feature (a non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Description

<SliceZone>'s resolve prop is provided as a way to ease migration from next-slicezone. next-slicezone's component uses a resolver function to convert a Slice's type to a React component. In this process, it converts the slice_type property into a pascalcased version.

This PR fixes a compatiblity issue by adding the pascalcase conversion.

Note: The resolver prop will be removed in a future version. When the prop is removed, the changes in this PR will also be removed.

Checklist:

• My change requires an update to the official documentation.
• All TSDoc comments are up-to-date and new ones have been added where necessary.
• All new and existing tests are passing.

🐫

[angeloashmore]

This is published in a pre-release version: v2.0.3-debug.0.

[codecov-commenter]

Codecov Report

Merging #109 (dbf6e76) into master (33dea53) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #109      +/-   ##
==========================================
+ Coverage   92.36%   92.39%   +0.02%     
==========================================
  Files          15       15              
  Lines         262      263       +1     
  Branches       58       58              
==========================================
+ Hits          242      243       +1     
  Misses          5        5              
  Partials       15       15              

Impacted Files	Coverage Δ
src/SliceZone.tsx	86.95% <100.00%> (+0.59%)	⬆️

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