Reland "Arm backend: Add real implementation for TOSA dialect ops (re-land)" v2

[rascani]

Reverts #20670 and relands #20537

In a first commit,

Arm backend: Add infra for real implementations of Tosa ops

Tested by applying the infra to the avg_pool2d Tosa dialect op.
The rewrite_avg_pool2d tests can now be ran to verify that
the produced Tosa is correct. To make it completely correct,
two additional passes need to be added to the test.

Then,

Arm backend: Add real impls to all TOSA dialect ops

Additionally,

Remove special case in ComputeOpsAOT pass for such ops,
since they can now be executed.
Start running the model in tests were this was previously
impossible due to ops not having a real impl.

cc @digantdesai @freddan80 @per @zingo @oscarandersson8218 @mansnils @Sebastian-Larsson @robell

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