feat: rtmp api

[binghaiwang]

1.add rtmp api

[codecov-io]

Codecov Report

Merging #359 into master will decrease coverage by 70.86%.
The diff coverage is 14.81%.

@@             Coverage Diff             @@
##           master     #359       +/-   ##
===========================================
- Coverage   96.45%   25.58%   -70.87%     
===========================================
  Files           8        9        +1     
  Lines        1268     1376      +108     
  Branches      249      269       +20     
===========================================
- Hits         1223      352      -871     
- Misses         45     1024      +979

Impacted Files	Coverage Δ
lib/client.js	45.01% <100%> (-48.19%)	⬇️
lib/rtmp.js	14.01% <14.01%> (ø)
lib/bucket.js	11.65% <0%> (-86.55%)	⬇️
lib/object.js	12.54% <0%> (-83.88%)	⬇️
lib/multipart.js	12.73% <0%> (-83.5%)	⬇️
lib/cluster.js	23.07% <0%> (-76.16%)	⬇️
lib/sts.js	28.37% <0%> (-66.22%)	⬇️
lib/wrapper.js	44.44% <0%> (-51.86%)	⬇️

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