Publish Gradle plugin snapshot builds (gobley#117)

## Changes

- Bumped the bindgen version from `0.2.0` to
`0.3.0-snapshot.20250429.0`.
- Made Gradle append the `-SNAPSHOT` suffix instead of the pre-release
information to the version when the bindgen version contains `-`.

## Issues Fixed

Fixes: gobley#98

Prepare for 0.2.0 release (gobley#104)

Prepare for 0.1.0 release (gobley#2)

Updated the changelog.