feat: Added support for read_json for duckdb and clickhouse

[adamnemecek]

DuckDB target didn't expose read_json, despite exposing read_csv and read_parquet.

It is unclear to me how I am supposed to add a test.

I tested it using this bash script

SQL=$(cargo run --quiet --bin prqlc -- compile <<'PRQL'
prql target:sql.duckdb
from (read_json "prqlc/prqlc/tests/integration/data/chinook/albums.json")
PRQL
)
duckdb -c "$SQL"

I tested only DuckDB.

[max-sixty]

@adamnemecek I pushed a bunch of changes, hope that's OK! thanks a lot for starting this, great work

[max-sixty]

(adding a function to the stdlib causes all the ids to increment, hence the very large diff...)

[adamnemecek]

@adamnemecek I pushed a bunch of changes, hope that's OK! thanks a lot for starting this, great work

Thanks a lot! In fact, I was hoping someone would pick up the torch since I knew there were things that were missing but I wasn't sure what to add as there is a lot going on.

[max-sixty]

Thanks a lot! In fact, I was hoping someone would pick up the torch since I knew there were things that were missing but I wasn't sure what to add as there is a lot going on.

very easy for me to finish it off! feel free to do this again if you have anything to add