Added functionality to insert values to the buffer in the endianness
order as specified by the user.
Change-Id: Ie33ac7a38a35cdd1cfdb2952233d13f09242cc8c
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/12472
Reviewed-by: Wyatt Hepler <hepler@google.com>
Commit-Queue: Shane Gomindes <shaneajg@google.com>