Add support for promoting Linalg views into new buffers.

This CL uses the generic CopyOp to promote a subview (constructed during tiling) into a new buffer + copy by:
  1. Creating a new buffer for the subview.
  2. Taking a view into the buffer and copying into it.
  3. Adapting the linalg op to operating on the view from point 2.
Tiling is extended with a boolean flag to enable promoting views (all or nothing for now).

More specifically, the current implementation creates a buffer that is always of the full size of the ranges of the subview. This produces a buffer whose size may be bigger
than the actual size of the `subView` at the boundaries and is related to the full/partial tile problem.

In practice, we introduce a `buffer`, a `fullLocalView` and a `partialLocalView` such that:
  * `buffer` is always the size of the subview in the full tile case.
  * `fullLocalView` is a dense contiguous view into that buffer.
  * `partialLocalView` is a dense non-contiguous slice of `fullLocalView`
     that corresponds to the size of `subView` and accounting for boundary
     effects.
The point of the full tile buffer is that constant static tile sizes are
folded and result in a buffer type with statically known size and alignment
properties.

Padding is introduced on the boundary tiles with a `fill` op followed by a partial `copy` op.

These behaviors will be refined later, on a per-need basis.

PiperOrigin-RevId: 256237319