Add hooks to json encoder to override default encoding or add support for unsupported types (#7015)

* add public json encoder trait

* tweak bench

* fmt

* tweak bench

* wip

* refactor EncoderOptions into a builder

* remove unused new method

* fmt

* wip

* remove dynamic dispatch

* clippy

* remove bench

* remove bench

* address perf

* add doctest

* fmt

* rename EncoderWithNullBuffer to NullableEncoder

* Update arrow-json/src/writer/mod.rs

Co-authored-by: Raphael Taylor-Davies <[email protected]>

* Update mod.rs

Co-authored-by: Raphael Taylor-Davies <[email protected]>

---------

Co-authored-by: Raphael Taylor-Davies <[email protected]>
Co-authored-by: Andrew Lamb <[email protected]>

Author: 3 people

arrow-json/src/lib.rs

@@ -75,7 +75,10 @@ pub mod reader;
 pub mod writer;
 
 pub use self::reader::{Reader, ReaderBuilder};
-pub use self::writer::{ArrayWriter, LineDelimitedWriter, Writer, WriterBuilder};
+pub use self::writer::{
+    ArrayWriter, Encoder, EncoderFactory, EncoderOptions, LineDelimitedWriter, Writer,
+    WriterBuilder,
+};
 use half::f16;
 use serde_json::{Number, Value};