refactor: rename page to doc

[AyushAgrawal-A2]

TOV-561
closes #6214

Before this pr, we have

• Page (store),
• PageBlock (having page and edgeless views)
• pageMode (have page and edgeless mode)

To avoid any confusion due to name overlap, I have renamed:

• Page (store) to Doc
• PageBlock to RootBlock, (this is in line with syntax doc.root & doc.slots.rootAddedOn. flavour is still "affine:page")
• pageMode to editorMode, having 2 modes - page, edgeless

So now -

• "page" word is now used only when related to page editorMode.
• "edgeless" word is now used only when related to edgeless editorMode.
• doc refers to store object only.
• root refers to root block only.

Exception -

• pageId is renamed to docId, (everywhere, except in block props & snapshot payload)
• pageVersion & pages properties in WorkspaceMetaState
• page property in BlockModel (this is marked as deprecated and expected usage is via doc getter and setter)

Change log - https://app.affine.pro/share/63a1780d-ee20-4b7f-ac70-f254e4154120/rduRN-2fxFklR-nLSZVYe

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[doodlewind]

Have double checked that this doesn't break data, we'll hand over and focus on the next step bumping AFFiNE.