feat(ffe): Add Feature Flagging and Experimentation support#3643

leoromanovsky wants to merge 2 commits into

ffe/1-libdatadog-bumpDataDog/dd-trace-php:ffe/1-libdatadog-bumpfrom

ffe/2-php-providerDataDog/dd-trace-php:ffe/2-php-providerCopy head branch name to clipboard