feat: support groups in groups

[levimykel]

Caution

Complete before merging:

• Merge and publish feat: support nested groups.
• Update @prismicio/mock in this PR to the non-alpha version.

Resolves: DT-2171

Description

This PR adds support for group fields nested within group fields. This is an upcoming Prismic feature.

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)

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.

[github-actions]

size-limit report 📦

Path	Size
dist/index.js	1.44 KB (0%)
dist/index.cjs	1.81 KB (0%)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.39%. Comparing base (bd7f977) to head (e49feea).
Report is 4 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #16      +/-   ##
==========================================
- Coverage   86.10%   85.39%   -0.71%     
==========================================
  Files           7        7              
  Lines        1094     1082      -12     
  Branches       53       51       -2     
==========================================
- Hits          942      924      -18     
- Misses        152      158       +6     

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