Adding suppress_instrumentation in Metrics

[hectorhdzg]

Fixes #524

[codecov-io]

Codecov Report

Merging #529 into master will increase coverage by 0.15%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #529      +/-   ##
==========================================
+ Coverage   89.47%   89.63%   +0.15%     
==========================================
  Files          43       43              
  Lines        2214     2218       +4     
  Branches      250      250              
==========================================
+ Hits         1981     1988       +7     
+ Misses        161      158       -3     
  Partials       72       72              

Impacted Files	Coverage Δ
...src/opentelemetry/sdk/metrics/export/controller.py	86.66% <100.00%> (+12.59%)	⬆️
...emetry-sdk/src/opentelemetry/sdk/trace/__init__.py	92.51% <0.00%> (ø)
...opentelemetry/sdk/context/propagation/b3_format.py	87.27% <0.00%> (ø)
...ry/trace/propagation/tracecontexthttptextformat.py	84.28% <0.00%> (ø)
...ntelemetry-api/src/opentelemetry/trace/__init__.py	83.12% <0.00%> (+0.10%)	⬆️

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[toumorokoshi]

Nice! thanks for adding this.