server: add jsonrpc support for fuo server (23333)

[cosven]

Before, only the web server(23332) supports jsonrpc.
Now, the fuo server(23333) also supports it.

Background
FeelUOwn webserver uses sanic as its web framework. However, the sanic package has many sub-dependencies. It's hard to run sanic on mobile devices such as Android.

[coveralls]

Pull Request Test Coverage Report for Build 13484934933

Details

• 13 of 23 (56.52%) changed or added relevant lines in 5 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.08%) to 55.88%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
feeluown/webserver/server.py	0	1	0.0%
feeluown/server/handlers/handle.py	2	4	50.0%
feeluown/server/handlers/jsonrpc_.py	6	9	66.67%
feeluown/cli/cli.py	3	7	42.86%

Totals
Change from base Build 13437641395:	0.08%
Covered Lines:	10254
Relevant Lines:	18350

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💛 - Coveralls