chore(changeset): add

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

.changeset/long-trains-allow.md

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+---
+"@vue-flow/background": minor
+---
+
+Add `lineWidth` prop to background component. Allows changing line bg stroke width

.changeset/slow-roses-buy.md

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+---
+"@vue-flow/background": minor
+---
+
+Allow setting gap as number or number array (x,y)

.changeset/wicked-falcons-unite.md

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+---
+"@vue-flow/background": minor
+---
+
+Add `offset` prop to background component. Allows for offsetting individual backgrounds to create a "multi" bg.