[SDK Configs] Rename split to definition to generalize the concept for Configs support#483

EmilianoSanchez wants to merge 2 commits intosdk-configs-handle-configs-dtosplitio/javascript-commons:sdk-configs-handle-configs-dtofrom

sdk-configs-rename-split-to-definitionsplitio/javascript-commons:sdk-configs-rename-split-to-definitionCopy head branch name to clipboard