Add CLI that optimizes an mbtiles of vector tiles

Nobody has claimed this yet.

A CLI tool that runs this module over an entire tileset in an mbtiles file would be a useful way of exploring optimizations and optimizing entire outputs from tile generators like tippecanoe.

The CLI could be:

```
./bin/optimize-mbtiles.js [style.json] [input.mbtiles] [output.mbtiles]
```

By default it would require writing a new mbtiles. But potentially it could accept an option to overwrite the existing mbtiles with optimized tiles (for the very experienced user).

Start by locating the existing optimization module and any current CLI entry points, then inspect how the project reads and writes vector tiles. Use the proposed bin/optimize-mbtiles.js arguments—style.json, input.mbtiles, and output.mbtiles—as the interface to validate. Done means the CLI processes the input tileset and produces an optimized output mbtiles file.

Written by the indexing model from the issue text.