refactor(edgeless): change surface selection to multi-instance

[doouding]

close #5623

Change

Change surface selection to a multi-instance approach.

All selected canvas elements are still put into a single selection instance, but the path property now has a value equal to the path of the currently rendered surface block:

const canvasMultiSelection = block.host.selection.getInstance(
                               buildPath(surfaceBlock),
                               'surface',
                               ['canvasElement1', 'canvasElement2', 'canvasElement3' ]
                             )

Now each selected block has a corresponding selection instance, and the path property equal to its actual rendering path in edgeless. So if there are multiple blocks are selected, we'll have more than one instance:

const blockSelections = selectedBlocks.map((block) => 
                          block.host.selection.getInstance(
                            buildPath(block)
                            'surface', 
                            [block.id]
                          )
                        )

The code above is just an explanation of how the surface selection is modified. During actual development, you just
need to use the previous method edgelessPage.selectionManager.set(elements, editing). This function will automatically create the correct selection instance internally.

Now we can query the selected block view through a selection like this:

const selection = edgelessBlock
                    .selectionManager
                    .selections
                    .filter(sel => sel.elements.include(targetBlock));

const blockView = editorHost.std.view.viewFromPath('block', selection.path);

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