[mlir][spirv] Add first 7 elementwise unary ops in TOSA Ext Inst Set (#185885)
This patch introduces the following elementwise unary operators:
spirv.Tosa.Abs
spirv.Tosa.BitwiseNot
spirv.Tosa.Ceil
spirv.Tosa.Clz
spirv.Tosa.Cos
spirv.Tosa.Exp
spirv.Tosa.Floor
Also dialect and serialization round-trip tests have been added.
Signed-off-by: Davide Grohmann <davide.grohmann@arm.com>