Returns the provided key-value pairs, wrapped with the specified delimiters.
insertkeyval( key, value, startDelimiter, endDelimiter )
key: (Text) A key or array of keys.
value: (Text) A value or array of values.
startDelimiter: (Text) String for the start delimiter.
endDelimiter: (Text) String for the end delimiter.
Text
insertkeyval({"hello","goodbye"}, {"alpha","beta"}, "[", "]")
returns [hello=alpha][goodbye=beta]