atopile gets a viewer (again) 🔍

We are adding a viewer to atopile (this is V2). You can use the viewer by running ato build and then ato view. For more details on this first iteration of the viewer, see this pull request: link.

What's Changed

• Add DRCs to KiCAD build by @mawildoer in https://github.com/atopile/atopile/pull/280
• Building a data structure for the viewer by @Timot05 in https://github.com/atopile/atopile/pull/284
• Adding a code viewer and a CLI command to spool it up by @Timot05 in https://github.com/atopile/atopile/pull/285

Full Changelog: https://github.com/atopile/atopile/compare/v0.2.38...v0.2.39