feat(orjson): Add support for orjson

[hannotauber]

At some point ujson was used for json loads #383 but it does not seem to be the case any more. This code has be lost. I do in v1.0.16

[hannotauber@toolbox python-binance]$ grep -r ujson
docs/changelog.rst:- Stock json lib to ujson (https://github.com/sammchardy/python-binance/pull/383)
requirements.txt:ujson
setup.py:        'requests', 'six', 'dateparser', 'aiohttp', 'ujson', 'websockets'

I am more confident with the work and benchmark results of orjson along with the licensing which comes with Apache 2 and MIT licenses.

[sammchardy]

@hannotauber orjson also requires Rust and can't be installed under some interpreters.

A better option would be allowing to pass a json serializer into the Client so that any could be used.

[carlosmiei]

@hannotauber It was implemented here: #1479 Now you just need to have orjson installed and python-binance will pick it up automatically.