ggml-cpu : rewrite concat as one row kernel for all types (#31179)
Every dst row comes from src0 or src1, or for dim 0 from the row of
src0 followed by the row of src1, so a single kernel covers every
type: a dense source row is one memcpy, quantized types included,
and a strided source is copied element by element with the element
size known at compile time.
Rows are split across threads instead of i2 alone, which is often 1,
and are copied in tiles of 32: for a transposed source the elements
are walked in the outer loop, so the rows of a tile read neighboring
addresses instead of jumping a full row stride per element.
Add transposed b cases to test_concat, the layout of the delta-net
conv input, and a perf case for it.
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