Extend typing to make JSON expressions work with order

[mqp]

Previously, if you wrote a query like this:

// presumes a table foos that has a JSONB `data` column
const { data, error } = await client.from('foos').select('id').order('data->>count', { ascending: true })

It would fail to typecheck, because the typing for order thought that if the first parameter isn't a column name from the foos table in the schema, then it must be a foreign table reference, so the foreignTable property in the options must be specified.

Now, Typescript can extract the column name from the data->>count expression, and check that against the schema.

I think there are other expressions you can use here (the Postgrest docs mention computed columns) but this covers the JSON accessor case. (We could also probably use similar code in the filter builder to get better typechecking when using JSON accessors in a variety of methods.)