feat: add webhook types

[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)
• [x] New feature (a non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Description

This PR adds types for Prismic webhooks. See #3 for more details.

Note: This PR depends on #15.

Checklist:

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

🐧

[codecov-commenter]

Codecov Report

Merging #17 (60d709d) into master (05c7ea8) will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master       #17   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            3         4    +1     
  Lines           59        64    +5     
=========================================
+ Hits            59        64    +5     

Impacted Files	Coverage Δ
src/customType.ts	100.00% <ø> (ø)
src/fields.ts	100.00% <ø> (ø)
src/index.ts	100.00% <100.00%> (ø)
src/webhook.ts	100.00% <100.00%> (ø)

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