Allow multiple Streaming queries per panel

[mikhail-vl]

Resolves #169

[codecov]

Codecov Report

Merging #213 (7d1a751) into master (0e1299e) will increase coverage by 0.13%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #213      +/-   ##
==========================================
+ Coverage   94.70%   94.84%   +0.13%     
==========================================
  Files          39       36       -3     
  Lines        1681     1667      -14     
  Branches       74       71       -3     
==========================================
- Hits         1592     1581      -11     
+ Misses         80       79       -1     
+ Partials        9        7       -2     

Impacted Files	Coverage Δ
src/time-series/index.ts	100.00% <ø> (ø)
src/components/query-editor/query-editor.tsx	100.00% <100.00%> (ø)
src/data-source/data-source.ts	97.95% <100.00%> (+6.29%)	⬆️
src/time-series/time-series.ts	100.00% <100.00%> (ø)

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[mikhail-vl]

Looks good!