fix(edgeless): layer issue

[doouding]

Fixes

Fixes BS-899
Fixes BS-926
Fixes BS-966

Other changes

Added a new mechanism to sync element properties that are stored in yjs to a local map. This way, even if an element is unloaded, you can still access its properties, preventing the issue of getting undefined values in many cases.

This mechanism will migrate to use the same infra of the block in the coming iteration.

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[doouding]

• fix(edgeless): layer issue #7747 👈
• master

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