feat: support trace strategy

[Yisaer]

support trace strategy head/always

1. head will check whether the source request has trace parent if enabled
2. alwayswill always trace if enabled

[codecov]

Codecov Report

Attention: Patch coverage is 51.72414% with 56 lines in your changes missing coverage. Please review.

Project coverage is 70.95%. Comparing base (58bb2c2) to head (7fa4b1f).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/topo/node/tracenode/trace_node.go	42.22%	23 Missing and 3 partials ⚠️
internal/server/rule_init.go	0.00%	10 Missing ⚠️
internal/topo/node/operations.go	0.00%	7 Missing ⚠️
internal/topo/node/batch_op.go	28.57%	4 Missing and 1 partial ⚠️
internal/server/rest.go	60.00%	3 Missing and 1 partial ⚠️
internal/topo/context/default.go	86.36%	3 Missing ⚠️
internal/topo/node/transform_op.go	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3284      +/-   ##
==========================================
+ Coverage   70.92%   70.95%   +0.03%     
==========================================
  Files         397      397              
  Lines       44631    44701      +70     
==========================================
+ Hits        31652    31716      +64     
- Misses      10464    10471       +7     
+ Partials     2515     2514       -1     

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[ngjaying]

Need docs for strategy setting.