feat: Denormalize ways & relations

[okdistribute]

This was a doozy since we're loading from pbf using osmpbf, and writing to o5m files using a different library. The two rust packages that have been written for these two formats don't really work well together and I had to manually stitch it together in main.rs

I wonder if it would be more performant to write a specific o5m writer that doesn't require buffering and converting all of these fields into memory.

For now, at least I have it working so next is to add some tests and load it into Eyros!