Save sparkle-fill-16.svg

[gavinmn]

Adds a sparkle icon

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: a5470ed487a49f65f5c24e23d3f12224076c4458

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

This PR includes changesets to release 1 package

| Name | Type | | ---------------- | ----- | | @primer/octicons | Minor |

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[colebemis]

Should this be called sparkle-fill-16 for consistency with the other filled icons?