Make editor legacy

[Darmody]

1. rename packages/editor to packages/legacy-editor
2. create new package packages/editor

More details:

#276
#378

[codecov]

Codecov Report

Merging #417 (f08aa4a) into main (ab8bb32) will increase coverage by 0.03%.
The diff coverage is 93.33%.

❗ Current head f08aa4a differs from pull request most recent head 3e75f98. Consider uploading reports for the commit 3e75f98 to get more accurate results

@@            Coverage Diff             @@
##             main     #417      +/-   ##
==========================================
+ Coverage   69.29%   69.33%   +0.03%     
==========================================
  Files        1055     1057       +2     
  Lines       17939    17946       +7     
  Branches     2475     2475              
==========================================
+ Hits        12431    12442      +11     
+ Misses       5203     5199       -4     
  Partials      305      305              

Flag	Coverage Δ
frontend-unit	64.83% <93.33%> (+0.03%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...legacy/common/components/TopbarMore/index.style.ts	0.00% <ø> (ø)
...-web/src/docs_legacy/pages/DocumentContentPage.tsx	0.00% <ø> (ø)
.../client-web/src/docs_legacy/pages/DocumentPage.tsx	0.00% <ø> (ø)
.../src/docs_legacy/pages/hooks/useDocSyncProvider.ts	0.00% <ø> (ø)
...useEditorOptions/useDiscussion/useCreateComment.ts	0.00% <ø> (ø)
...itorOptions/useDiscussion/useCreateConversation.ts	0.00% <ø> (ø)
...itorOptions/useDiscussion/useDeleteConversation.ts	0.00% <ø> (ø)
...ks/useEditorOptions/useDiscussion/useDiscussion.ts	0.00% <ø> (ø)
...EditorOptions/useDiscussion/useGetConversations.ts	0.00% <ø> (ø)
...EditorOptions/useDiscussion/useOpenConversation.ts	0.00% <ø> (ø)
... and 516 more

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[github-actions]

This pull request has been built and is available for preview at pr417.mashcard.dev.
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