feat: typescript support for rpc

[gxcsoccer]

Checklist

• [x] npm test passes
• [ ] tests and/or benchmarks are included
• [ ] documentation is changed or added
• [ ] commit message follows commit guidelines

Affected core subsystem(s)

Description of change

[codecov[bot]]

Codecov Report

Merging #8 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master       #8   +/-   ##
=======================================
  Coverage   88.88%   88.88%           
=======================================
  Files           7        7           
  Lines          27       27           
=======================================
  Hits           24       24           
  Misses          3        3

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[gxcsoccer]

https://github.com/eggjs/jar2proxy/pull/8