Only JSON.parse JSON strings in tags/logs values

[tiffon]

Fix #146.

Only applies JSON.parse(...) to the values of tags or log-fields when it returns an object.

[codecov]

Codecov Report

Merging #162 into master will decrease coverage by 0.15%.
The diff coverage is 60%.

@@            Coverage Diff             @@
##           master     #162      +/-   ##
==========================================
- Coverage   92.77%   92.62%   -0.16%     
==========================================
  Files          85       85              
  Lines        1882     1884       +2     
  Branches      367      368       +1     
==========================================
- Hits         1746     1745       -1     
- Misses        124      126       +2     
- Partials       12       13       +1

Impacted Files	Coverage Δ
...e/TraceTimelineViewer/SpanDetail/KeyValuesTable.js	77.77% <60%> (-22.23%)	⬇️
...neViewer/TimelineHeaderRow/TimelineViewingLayer.js	88.88% <0%> (-1.86%)	⬇️

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