Allow bytes and string for JSON/CSV input data with format option

[texodus]

This PR extends Python and JavaScript APIs to allow String/str/bytes/ArrayBuffer/UInt8Array input data types for JSON Rows/Columns and CSV data, using the new format keyword argument to Client::table. This is useful several interesting performance optimizations, such as:

• Using .arrayBuffer() over .text() for Response objects containing CSVs (Fixes Reading a csv file as arrayBuffer instead of text in browser #2746).
• Reading JSON from a file or other unparsed source without deserializing.

Use it like this:

data = '{"x": [1,2,3], "y": [4,5,6]}';
table = await client.table(data, {format: "columns"});

Included are tests and keyword argument docs for both Python and JavaScript.