[mlir][tosa] Convert TOSA enumerations from `StringBasedAttr` to `Tosa_I32EnumAttr` (#152856) Fixes #152129 Use `Tosa_I32EnumAttr` instead of `StringBasedAttr` to represent Tosa enumerations. This PR replaces `StringBasedAttr` with `Tosa_I32EnumAttr` to represent Tosa enumerations as per the specification. The intent is to make the IR and C++ APIs more type-safe and prevent fragile string comparisons in passes. Enumerations rewritten are: - `Tosa_ResizeTypeAttr` - `Tosa_NanPropagationAttr` - `Tosa_RoundingTypeAttr` **BREAKING CHANGE**: This commit changes attribute assembly and the C++ API surface for the listed attributes. Code that previously used `StringAttr` for these fields must now be updated to use the new enum representation. In `.mlir` files, replace string literals with the enum assembly (e.g. `mode = #tosa.resize_type<BILINEAR>`). In C++, update call sites to either pass the generated enum (e.g. `::mlir::tosa::RoundingType::SINGLE_ROUND`) into builder overloads or construct the typed attribute with `tosa::RoundingTypeAttr::get(context, /*enum*/)` and pass that.
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