Fix ORDER BY arg parsing in sqlite

[andriygm]

sqlc currently doesn't handle bound ORDER BY clauses in sqlite, nor does it have tests for this behavior. This PR attempts for rectify this. Closes #3788.

[andriygm]

currently, base behavior works but mixing params like so:

-- name: ListAuthorsColumnSortDirection :many SELECT * FROM authors WHERE id > ? ORDER BY CASE WHEN @order_by = 'asc' THEN name END ASC, CASE WHEN @order_by = 'desc' OR @order_by IS NULL THEN name END DESC;

produces this incorrect output (question marks in CASE clauses should instead be same variable)

-- name: ListAuthorsColumnSortDirection :many SELECT id, name, bio FROM authors WHERE id > ? ORDER BY CASE WHEN ? = 'asc' THEN name END ASC, CASE WHEN ? = 'desc' OR ? IS NULL THEN name END DESC

this can still be worked around by using named params in this case.

[ilikeorangutans]

How can we get this PR merged? I'm currently running into this issue :(