Don't drop annotations in source data

[dlurton]

Similar issue in PartiQL-Kotlin partiql/partiql-lang-kotlin#1093

PartiQL-Rust drops all annotations in source data, but it shouldn't. Annotations include important context needed for downstream applications to know how to process the query results. This will likely become a big issue for my team's PartiQL product in the next few months.

To reproduce this issue, I cloned the current mainline of partiql-rust-playground and ran the query:

select * from `[ { foo: { bar: some_annotation::42 } } ]`

The result was:

<<{ foo: { bar: 42 } }>>

However, I think the result should be:

<<{ foo: { bar: some_annotation::42 } }>>