MLBEDSW-9780: Handle a few more TFLite options

Add support for reading and writing the following options tables:

* CallOnceOptions
* VarHandleOptions
* ReadVariableOptions
* AssignVariableOptions

Signed-off-by: Johan Gunnarsson <johan.gunnarsson@arm.com>
Change-Id: Iaea0c79bdead53e29613e96b650ab7d3c9de97b5