Auto tag when Project.toml updated

[KDr2]

#53

When version number in Project.toml is updated, a tag will be made according to the new version.

But we can't upload artifacts to a tag, we can only upload artifacts to a release. So now the process is:

1. someone updates the version number in Project.toml then commit the change
2. the push event triggers GH action, a new tag will be made on that commit
3. TagBot creates a new release on the new tag
4. GH action is triggered by the release event, then builds and uploads the artifacts