feat: sampling feature for logger#7

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heitorlessa merged 4 commits intoaws-powertools:developfrom

danilohgds:sampling_feature

Feb 20, 2020

Commits on Feb 18, 2020

feature: ability to pass sampling_rate to logger setup so calls may get sampled in "debug" setup.
danilohgds
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Commits on Feb 19, 2020

formatting
danilohgds
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Commits on Feb 20, 2020

changes to tests, to include a scenario with 100% sampling overwriting LOG_LEVEL.

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additional assertion to check message from stdout.

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