Add span name#49

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KolbyMcGarrah wants to merge 4 commits intoopencensus-integrations:masterfrom

KolbyMcGarrah:add-span-name

Commits on Mar 4, 2021

added foption to allow dynamic span names
KolbyMcGarrah
committed
added function to set FormatSpanName
KolbyMcGarrah
committed
Updated span default names. Added helper func
KolbyMcGarrah
committed

Commits on Mar 5, 2021

updated formatted span name to include operation name
KolbyMcGarrah
committed