refactor: metadata in map[string]string

[woorui]

Summary

Simplifying DataFrame struct, new features implementation will be easier.

Intended Outcome

Before, Metadata was encoded by y3 codec, it's a streaming codec used for reduce CPU workload in high load. But developers confused a lot when adding news features. After refactor Metadata to MsgPack, reduce the complexity.

How will it work?

Using map[string]string to store metadata as key-value pairs, and Using msgPack to encode and decode it for transmitting. The current definition of the DataFrame struct is as follows:

type DataFrame struct {
	// Tag is used for routing data.
	Tag Tag
	// Metadata stores additional data beyond the Payload,
	// it is an map[string]string{} that be encoded by msgpack.
	Metadata []byte
	// Payload is the data to transmit.
	Payload []byte
}

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[codecov]

Codecov Report

Merging #571 (18673df) into master (4e0845e) will increase coverage by 1.29%.
The diff coverage is 73.40%.

❗ Current head 18673df differs from pull request most recent head 12c60c4. Consider uploading reports for the commit 12c60c4 to get more accurate results

@@            Coverage Diff             @@
##           master     #571      +/-   ##
==========================================
+ Coverage   65.05%   66.35%   +1.29%     
==========================================
  Files          40       39       -1     
  Lines        2767     2749      -18     
==========================================
+ Hits         1800     1824      +24     
+ Misses        840      800      -40     
+ Partials      127      125       -2     

Files Changed	Coverage Δ
core/client.go	77.88% <ø> (+4.48%)	⬆️
rx/runtime.go	0.00% <0.00%> (ø)
rx/stream_operator.go	32.68% <0.00%> (ø)
sfn.go	33.72% <0.00%> (ø)
zipper.go	72.41% <ø> (-0.47%)	⬇️
source.go	49.12% <28.57%> (-6.20%)	⬇️
core/context.go	74.69% <44.44%> (-13.37%)	⬇️
core/stream_group.go	75.28% <57.89%> (-4.27%)	⬇️
core/server.go	71.78% <69.56%> (+4.83%)	⬆️
core/auth/auth.go	100.00% <100.00%> (ø)
... and 7 more

... and 1 file with indirect coverage changes

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