Do not strip leading zeros from trace IDs

[yurishkuro]

• Implements requirement Jaeger clients should generate full-length trace/span IDs jaeger#1657
• Resolves Flaky unit test io.jaegertracing.zipkin.internal.V2SpanConverterTest#testConvertSpanWith128BitTraceId #745

[codecov]

Codecov Report

Merging #746 into master will decrease coverage by 0.21%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master     #746      +/-   ##
============================================
- Coverage     89.10%   88.88%   -0.22%     
  Complexity      603      603              
============================================
  Files            73       73              
  Lines          2257     2259       +2     
  Branches        294      295       +1     
============================================
- Hits           2011     2008       -3     
- Misses          155      159       +4     
- Partials         91       92       +1     

Impacted Files	Coverage Δ	Complexity Δ
...a/io/jaegertracing/internal/JaegerSpanContext.java	98.03% <100.00%> (-0.08%)	31.00 <0.00> (-1.00)
...egertracing/internal/propagation/TextMapCodec.java	92.72% <100.00%> (ø)	36.00 <0.00> (+1.00)
...in/java/io/jaegertracing/internal/utils/Utils.java	86.36% <100.00%> (+3.03%)	8.00 <2.00> (+2.00)
...rtracing/internal/reporters/CompositeReporter.java	71.42% <0.00%> (-28.58%)	6.00% <0.00%> (-1.00%)
...gertracing/internal/reporters/LoggingReporter.java	81.81% <0.00%> (-9.10%)	4.00% <0.00%> (-1.00%)

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