This PR fixed
[issues](https://github.com/iree-org/iree/actions/runs/21956878131/job/63423389868#step:7:211)
caused by dropping `LLVMSupport` in PR #180986, dropped the remaining
direct llvm dependencies from mlir-python binding files.
Previously `LLVMSupport` was dropped while some uncleaned `mlir/CAPI/*`
sources were still being pulled into mlir-py, and those files still
directly depended on LLVM headers. The issue was masked via a global
`include_directories(${LLVM_INCLUDE_DIRS})` in `mlir/CMakeLists.txt`,
out-of-tree builds (e.g., IREE) that define Python module targets
outside the mlir/ directory tree would fail with "no such llvm file"
errors.
In this PR, I added a C API for each (upstream) MLIR type to retrieve
its type name (for example, `IntegerType` -> `mlirIntegerTypeGetName()`
-> `"builtin.integer"`), and exposed a corresponding `type_name` class
attribute in the Python bindings (e.g., `IntegerType.type_name` ->
`"builtin.integer"`). This can be used in various places to avoid
hard-coded strings, such as eliminating the manual string in
`irdl.base("!builtin.integer")`.
Note that parts of this PR (mainly mechanical changes) were produced via
GitHub Copilot and GPT-5.2. I have manually reviewed the changes and
verified them with tests to ensure correctness.
This PR ports all in-tree dialect extensions to use the
`PyConcreteType`, `PyConcreteAttribute` CRTPs instead of
`mlir_pure_subclass`. After this PR we can soft deprecate
`mlir_pure_subclass`. Also API signatures are updated to use `Py*`
instead of `Mlir*` so that type "inference" and hints are improved.
