Migrated turf-meta to typescript (bare bones edition)

[smallsaucepan]

Minimally intrusive conversion of turf-meta to typescript. Rather than try to untangle internal type inconsistencies, leave the public interface and runtime as is and sprinkle a liberal dose of @ts-expect-error statements. Once decided on a resolution strategy we can remove those as we go.

Note the excludeWrapCoord parameter on coordReduce wasn't defined in the d.ts. It is documented and a parameter at runtime, so have added it as an optional fourth param. Believe this would be non-breaking.

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• Meaningful title, including the name of the package being modified.
• Summary of the changes.
• Heads up if this is a breaking change.
• Any issues this resolves.
• Inclusion of your details in the contributors field of package.json - you've earned it! 👏
• Confirmation you've read the steps for preparing a pull request.

[mfedderly]

Thanks!

For those curious about all of the @ts-expect-error introduced here, this is a compromise to avoid introducing breaking changes in a minor release. If you try to start removing these errors things start to get out of hand quickly.