remove csv export for list column - not supported by polars

[lkarthee]

CSV export not supported by Polars if column contains nested data - pola-rs/polars#6038

[lkarthee]

 [error] GenServer #PID<0.338.0> terminating
** (RuntimeError) dump_csv failed: %RuntimeError{message: "Polars Error: CSV format does not support nested data"}
    (explorer 0.8.0-dev) lib/explorer/data_frame.ex:1384: Explorer.DataFrame.dump_csv!/2
    (kino_explorer 0.1.14) lib/kino/explorer.ex:96: Kino.Explorer.export_data/2
    (kino 0.12.1) lib/kino/table.ex:132: Kino.Table.handle_event/3
    (kino 0.12.1) lib/kino/js/live/server.ex:116: Kino.JS.Live.Server.call_handle_info/3
    (kino 0.12.1) lib/kino/js/live/server.ex:71: Kino.JS.Live.Server.handle_info/2
    (stdlib 5.1.1) gen_server.erl:1077: :gen_server.try_handle_info/3
    (stdlib 5.1.1) gen_server.erl:1165: :gen_server.handle_msg/6
    (stdlib 5.1.1) proc_lib.erl:241: :proc_lib.init_p_do_apply/3
Last message: {:event, "download", %{"format" => "CSV"}, %{origin: "o6whecuftdebsgy5", ref: "xofgz5j345y5umjfo543tpyxdeq5mpp7"}}
State: %{module: Kino.Table, export: #Function<3.116305928/1 in Kino.Table.new/3>, ctx: %Kino.JS.Live.Context{assigns: %{info: %{name: "Series", export: %{formats: ["CSV", "NDJSON", "Parquet"]}, features: [:export, :pagination, :sorting]}, module: Kino.Explorer, state: %{columns: [%{label: "series", type: "list", key: "series", summary: %{keys: ["unique", "top", "top freq", "nulls"], values: ["5", <<1>>, "1", "0"]}}], total_rows: 5, df: #Explorer.DataFrame<
          Polars[5 x 1]
          series list[s64] [[1], [2], [3], [4], [...]]
        >, groups: []}, limit: 10, content: %{data: [["[1]", "[2]", "[3]", "[4]", "[5]"]], columns: [%{label: "series", type: "list", key: "0", summary: %{keys: ["unique", "top", "top freq", "nulls"], values: ["5", <<1>>, "1", "0"]}}], limit: 10, page: 1, order: nil, total_rows: 5, data_orientation: :columns, max_page: 1, page_length: 5}, page: 1, order: nil, key_to_string: %{"series" => "0"}}, origin: nil, __private__: %{ref: "xofgz5j345y5umjfo543tpyxdeq5mpp7", client_ids_with_pid: %{"gvnozrhypivscjlc" => #PID<12985.5404.0>, "o6whecuftdebsgy5" => #PID<12985.5310.0>}, monitors_with_client_id: %{#Reference<0.386934388.2180775939.109449> => "gvnozrhypivscjlc", #Reference<0.386934388.2180775939.109458> => "o6whecuftdebsgy5"}}}}

[cristineguadelupe]

Good catch! Thanks