[TOSA] Tests failing for Tosa config for `aten.as_strided` op

[vivekkhandelwal1]

In this patch, I have added a decomposition for the as_strided op. As a result, the tests that were passing earlier for the Tosa config are now failing because, instead of being lowered in the TorchToTosa pipeline, the op is being decomposed during the TorchFunctionToTorchBackendPipeline and cannot be converted to Tosa. Hence, the tests that passed when lowering for as_strided was added, some of them are now failing.

In total, 11 tests are failing; they are as follows:

ChunkListUnpackDynamic_Module_basic
ChunkListUnpackUnevenDynamic_Module_basic
ChunkListUnpackUneven_Module_basic
ChunkListUnpack_Module_basic
NativeGroupNormModule_basic
SplitTensorGetItem_Module_basic
SplitTensorLastSmallerModule_basic
SplitTensorListUnpackModule_basic
SplitTensorNegativeDimModule_basic
SplitWithSizesListUnpackModule_basic
SplitWithSizes_Module_basic

@justin-ngo-arm, can you please take a look at this issue?

[vivekkhandelwal1]

Assigned to @justin-ngo-arm.