[FEA]: Identity matrix

Is this a new feature, an improvement, or a change to existing functionality?

New Feature

How would you describe the priority of this feature request?

Critical (currently preventing usage)

Please provide a clear description of problem this feature solves

Have trouble solving small linear systems using iterative methods without the support of creating identity matrix(tile).

Feature Description

Need a way to create identity tile (1s on the diagonal, 0s elsewhere).
It will be great if diag is also supported.

Describe your ideal solution

Proposed API would be:

ct.identity(4, dtype=ct.float32)
# returns Tile[float32, (4, 4)]

# for any tile `values` with type Tile[float32, (8)]
ct.diag(values)
# returns Tile[float32, (8, 8)]

Describe any alternatives you have considered

No response

Additional context

No response

Contributing Guidelines

• I agree to follow cuTile Python's contributing guidelines
• I have searched the open feature requests and have found no duplicates for this feature request

Start by reviewing the cuTile Python API and contributing guidelines, then compare the proposed ct.identity and ct.diag signatures with existing public APIs. Done means both operations are available with the requested tile shapes and dtype behavior, with coverage for the examples described in the issue.