Add the ability to split string into multiple parts

[ToddBaginski]

Currently we can split a string into two parts (https://powerusers.microsoft.com/t5/PowerApps-Ideas/Substring-split-parse-a-string/idi-p/3682). However, there's no way to split a string into multiple parts.

For ex: “user1@domian.com;user2@domain.com;user3@domain.com” split by “;”