chore: add changesets

Signed-off-by: braks <78412429+bcakmakoglu@users.noreply.github.com>

.changeset/cyan-boxes-beam.md

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+---
+'@vue-flow/core': minor
+---
+
+Allow customizing the controls of the viewport and the selection box.
+
+## Props
+- `selectionOnDrag`: Selection box without extra button press (need to set `:pan-on-drag="false"` or `:pan-on-drag="[2]"`[RightClick]).
+- `panOnDrag`: Can now be a boolean or a number[], this allows you to configure every mouse button as a drag button. [1, 2] would mean that you can drag via middle and right mouse button.
+- `panActivationKeyCode`: Key code (or KeyFilter) for activating dragging (useful when using selectionOnDrag).
+- `selectionMode`: You can choose if the selection box needs to contain a node fully (`SelectionMode.Full`) or partially (`SelectionMode.Partial`) to select.
+
+## Events
+
+- `onSelectionStart`: Emitted when the selection box is started.
+- `onSelectionEnd`: Emitted when the selection box is ended.
+- `onViewportChangeStart`: Emitted when viewport change has started.
+- `onViewportChange`: Emitted when viewport is changed.
+- `onViewportChangeEnd`: Emitted when viewport change has ended.

.changeset/stupid-vans-act.md

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+---
+'@vue-flow/core': patch
+---
+
+Add a11y support to selection box