Fix --split-max-size (#6655)

* Fix --split-max-size

Byte size calculation was done on int and overflowed.

* add tests.sh

* add examples test scripts to ci run

Will autodiscover examples/*/tests.sh scripts and run them.

* move WORK_PATH to a subdirectory

* clean up before and after test

* explicitly define which scripts to run

* add --split-max-size to readme