Remove resource setter and getter from Tracer

[pavolloffay]

Supersedes #352

Signed-off-by: Pavol Loffay [email protected]

[codecov-io]

Codecov Report

Merging #387 into master will increase coverage by 0.19%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #387      +/-   ##
============================================
+ Coverage     64.58%   64.78%   +0.19%     
  Complexity      347      347              
============================================
  Files            57       57              
  Lines          1316     1312       -4     
  Branches        118      118              
============================================
  Hits            850      850              
+ Misses          423      419       -4     
  Partials         43       43

Impacted Files	Coverage Δ	Complexity Δ
...ain/java/io/opentelemetry/sdk/trace/TracerSdk.java	46.15% <ø> (+6.15%)	5 <0> (ø)	⬇️
...ain/java/io/opentelemetry/trace/DefaultTracer.java	71.79% <ø> (+3.5%)	6 <0> (ø)	⬇️

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