✨ Introduce BSON field type

[joocer]

record in Parquet, etc, as BLOB, but parse to dictionary-like field field

implement optimizations for the existing ->, ->> and @? operators

implement functions:

• SELECT EXTRACT_PATH(bson_field, 'address.city') FROM my_table;
• SELECT CAST(bson_field->'age' AS INTEGER) FROM my_table;
• SELECT FILTER(bson_field->'orders', 'order.amount > 100') FROM my_table;