feat: enable builtin spellchecker (#20692)

* chore: add code required to use chromes spellchecker

* chore: fix linting

* chore: manifests needs buildflags now

* chore: add dictionarySuggestions to the context menu event when the spellchecker is active

* chore: enable by default for windows builds

* chore: add patch to remove incognito usage in the spellchecker

* chore: add dependencies on spellcheck common and flags

* chore: conditionally include spell check panel impl

* chore: fix deps for spellcheck feature flags

* chore: add patch for electron resources

* chore: add dependency on //components/language/core/browser

* chore: patches to make hunspell work on windows

* build: collect hunspell dictionaries into a zip file and publish

* chore: clean up patches

* chore: add docs and set spell checker url method

* chore: fix error handling

* chore: fix hash logic

* build: update hunspell filename generator

* fix: default spellchecker list to the current system locale if we can

* docs: document the language getter

* chore: patch IDS_ resources for linux builds

* feat: add spellcheck webpref flag to disable the builtin spellchecker

* chore: fix docs typo

* chore: clean up spellchecker impl as per feedback

* remove unneeded deps

script/release/release.js

@@ -130,6 +130,7 @@ function assetsForVersion (version, validatingRelease) {
     `electron-${version}-win32-arm64.zip`,
     `electron-api.json`,
     `electron.d.ts`,
+    `hunspell_dictionaries.zip`,
     `ffmpeg-${version}-darwin-x64.zip`,
     `ffmpeg-${version}-linux-arm64.zip`,
     `ffmpeg-${version}-linux-armv7l.zip`,