feat: Add option to offset markers

[knd775]

This implements the offset option, which allows a marker to be offset from its point.

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🦋 Changeset detected

Latest commit: a5cefb647427570a395b97f64750ace97cb26b7c

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

| Name | Type | | --------------- | ----- | | svelte-maplibre | Minor |

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[dimfeld]

Thank you!

[dimfeld]

Published as 0.4.2