[enh] add pinpoint_add_traceV1

[eeliu]

• rename NodeID to enum
• remove c-style in TraceNode
• mark addChild re-entrant
• add register_span_handler
• testcase for mergeTraceNodeTree
• add checkOpt and its testcase
• pinpoint_start_traceV1 and its testcase

[codecov]

Codecov Report

Merging #444 (0a73863) into master (85b1f39) will increase coverage by 0.47%.
The diff coverage is 80.39%.

@@            Coverage Diff             @@
##           master     #444      +/-   ##
==========================================
+ Coverage   75.02%   75.50%   +0.47%     
==========================================
  Files          20       20              
  Lines         961     1041      +80     
==========================================
+ Hits          721      786      +65     
- Misses        240      255      +15     

Impacted Files	Coverage Δ
common/src/common.cpp	66.66% <63.98%> (-3.34%)	⬇️
common/src/ConnectionPool/TransLayer.cpp	82.52% <83.33%> (+1.15%)	⬆️
common/src/Util/Helper.cpp	87.87% <87.87%> (-8.68%)	⬇️
common/src/NodePool/PoolManager.cpp	91.89% <94.44%> (+8.96%)	⬆️
common/src/NodePool/PoolManager.h	100.00% <100.00%> (ø)
common/src/NodePool/TraceNode.cpp	100.00% <100.00%> (ø)
common/src/NodePool/TraceNode.h	100.00% <100.00%> (ø)
common/src/Util/Helper.h	100.00% <100.00%> (ø)

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[EyelynSu]

LGTM