Arm backend: support int16 and int32 output tables. (#9359)

Change insert_table_ops to support int16 table generation. Insert
rescale in insert_table_ops if needed.
Remove guard for int16 on insert_rescales.
The new test shows how the quantizer can be configured to change the
quantization of Sigmoid.

cc @digantdesai @freddan80 @per @zingo @oscarandersson8218

Signed-off-by: Erik Lundell <erik.lundell@arm.com>