Query Usage Analytics

We want to gather usage analytics from a GraphQL query. Usage analytics of models, commands, fields, permissions, relationships etc. being used in the query.

For now, this crate defines the types we would construct for gathering usage analytics. Later, this can also include functions required to build up these types. Ideally, this crate should expose an API which the engine IR generation or query plan generation can use to create a usage analytics type and serialize and emit it.

The types here are a simplified version of the GraphQL query AST, OpenDD and metadata-resolve types.