feat: add @prismicio/client/richtext entry

[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

This PR adds a new @prismicio/client/richtext entry.

It ports all of @prismicio/richtext to @prismicio/client as an isolated entry. An isolated entry was selected over exporting it adjacent to all other helpers to minimize accidental usage; rich text helpers are low-level functions to be used primarily in high-level framework SDKs, like @prismicio/react and @prismicio/vue.

@prismicio/richtext will be deprecated once this PR is published. All packages dependent on @prismicio/richtext should be upgraded to @prismicio/client/richtext.

For more details behind this PR's motivation, see this thread: prismicio/prismic-richtext#63 (comment)

Migration guide

1. Update to the latest version of @prismicio/client:

   npm install @prismicio/client@latest

2. Replace all @prismicio/richtext imports with @prismicio/client/richtext:

   - import { serialize } from "@prismicio/richtext";
   + import { serialize } from "@prismicio/client/richtext";

3. Uninstall @prismicio/richtext:

   npm uninstall @prismicio/richtext

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.

🦕

[lihbr]

LGTM but we need to declare the new entry point in the package.json, remove the dependency on @prismicio/richtext and refactor helpers to use the internal one no? Or do you want to do that in another PR?

[codecov-commenter]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (b43557d) 99.96% compared to head (f63f65e) 99.97%.

❗ Current head f63f65e differs from pull request most recent head f166735. Consider uploading reports for the commit f166735 to get more accurate results

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Additional details and impacted files

@@           Coverage Diff            @@
##           master     #318    +/-   ##
========================================
  Coverage   99.96%   99.97%            
========================================
  Files          50       57     +7     
  Lines        6251     6794   +543     
  Branches      332      374    +42     
========================================
+ Hits         6249     6792   +543     
  Misses          2        2            

Files	Coverage Δ
src/helpers/asHTML.ts	100.00% <100.00%> (ø)
src/helpers/asText.ts	100.00% <100.00%> (ø)
src/index.ts	100.00% <100.00%> (ø)
src/lib/serializerHelpers.ts	100.00% <100.00%> (ø)
src/richtext/asText.ts	100.00% <100.00%> (ø)
src/richtext/asTree.ts	100.00% <100.00%> (ø)
src/richtext/composeSerializers.ts	100.00% <100.00%> (ø)
src/richtext/index.ts	100.00% <100.00%> (ø)
src/richtext/serialize.ts	100.00% <100.00%> (ø)
src/richtext/types.ts	100.00% <100.00%> (ø)
... and 1 more

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