Add new dimension types

[jstcki]

Adds support for ordinal and geographical dimensions

• Consolidates Nominal/Ordinal Dimensions into CategoricalDimension with hasOrder property
• Adds GeoShape and GeoPoint Dimensions
• Adds position to dimension values (optional, only used when dimension is marked as ordinal)
• Moves properties to specific dimension types (like unit)

To do:

• [ ] Fix type errors
• [ ] Implement resolvers

[jstcki]

Discussed with @ptbrowne that we're not aiming to merge this PR but treat it as an exploration to be reviewed and maybe be used for reference in a future refactor of the GraphQL schema. Support for ordinal dimension will follow a more simple approach that doesn't impact the code base as extensively.