Arm backend: Add SDPA decomposition to annotation pipeline (#10657)

Adds SDPA decomposition and since SDPA is decomposed to safe_softmax
instead of regular softmax, softmax decomposition is updated to handle
safe_softmax.

Co-authored-by: Måns Nilsson <mans.nilsson@arm.com>
Co-authored-by: Per Åstrand <per.astrand@arm.com>