Add sampling path for tracer sampler config (#532)

[flysnoworg]

Which problem is this PR solving?

Resolves #532

Short description of the changes

• Add sampling path for tracer sampler config(Cannot configure samplingPath for remote sampling in trace configuration #532)

Signed-off-by: 飞雪无情 ls8707@gmail.com

[codecov]

Codecov Report

Merging #533 (f957c9e) into master (5a60f1e) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #533   +/-   ##
=======================================
  Coverage   98.72%   98.73%           
=======================================
  Files          50       50           
  Lines        2044     2048    +4     
  Branches      386      387    +1     
=======================================
+ Hits         2018     2022    +4     
  Misses         26       26           

Impacted Files	Coverage Δ
src/configuration.js	99.00% <100.00%> (+<0.01%)	⬆️
src/configuration_env.js	100.00% <100.00%> (ø)

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