add toolbar.additionalComponent, remove initialState for react editor state hooks

[acao]

No description provided.

[changeset-bot]

🦋 Changeset detected

Latest commit: ea19c44

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 4 packages

Name	Type
@graphiql/react	Patch
@graphiql/plugin-code-exporter	Patch
@graphiql/plugin-explorer	Patch
graphiql	Patch

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[codecov]

Codecov Report

Merging #3447 (ea19c44) into main (2348641) will increase coverage by 0.10%.
Report is 19 commits behind head on main.
The diff coverage is 79.31%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3447      +/-   ##
==========================================
+ Coverage   55.75%   55.85%   +0.10%     
==========================================
  Files         110      110              
  Lines        5243     5264      +21     
  Branches     1426     1435       +9     
==========================================
+ Hits         2923     2940      +17     
- Misses       1897     1898       +1     
- Partials      423      426       +3     

Files	Coverage Δ
packages/graphiql-react/src/editor/context.tsx	73.39% <100.00%> (ø)
...raphql-language-service-server/src/GraphQLCache.ts	50.88% <50.00%> (ø)
...ql-language-service-server/src/MessageProcessor.ts	46.11% <50.00%> (-0.11%)	⬇️
...nguage-service/src/utils/getVariablesJSONSchema.ts	94.59% <98.38%> (+0.71%)	⬆️
packages/graphiql/src/components/GraphiQL.tsx	68.96% <0.00%> (-0.97%)	⬇️
packages/graphiql-react/src/editor/hooks.ts	40.15% <23.52%> (+1.56%)	⬆️

[github-actions]

The latest changes of this PR are available as canary in npm (based on the declared changesets):

graphiql@3.0.9-canary-5c561479.0
@graphiql/plugin-code-exporter@1.0.2-canary-5c561479.0
@graphiql/plugin-explorer@1.0.2-canary-5c561479.0
@graphiql/react@0.20.2-canary-5c561479.0