[C++][Compute] Add utf8_format kernel

[asfimport]

This should be an inverse operation of the split kernels and extract_regex taking a list/struct-of-strings argument and combining it into a single string output with a format string (provided through a FunctionOptions subclass).

Reporter: Ben Kietzman / @bkietz
Watchers: Rok Mihevc / @rok

Related issues:

• [C++] String algorithm library for StringArray/BinaryArray (is a child of)
• [C++] String formatting kernel (duplicates)

_{Note: This issue was originally created as ARROW-12990. Please see the migration documentation for further details.}

[asfimport]

Joris Van den Bossche / @jorisvandenbossche:
The inverse of the split kernel is "binary_join" which is already implemented?

[asfimport]

Ian Cook / @ianmcook:
This is related to (possibly duplicated by?) ARROW-13106