Add clamp operator to Arm backend (#7935)

* Add clamp operator to Arm backend

* Add support for aten.clamp
* Amend QuantizeFullArgument pass to include quantization of clamp arguments

Signed-off-by: Tom Allsop <tom.allsop@arm.com>

Change-Id: I432f4ec60facc50fe45ca05c98308924d6e18109

* Address merge conflicts and typing issues

Signed-off-by: Tom Allsop <tom.allsop@arm.com>
Change-Id: If9f6bbb9d23f00b9cea6d00c6aa97a6d5d3e77ab

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Signed-off-by: Tom Allsop <tom.allsop@arm.com>