[mlir][spirv] Implement vector type legalization for function signatures (#98337) ### Description This PR implements a minimal version of function signature conversion to unroll vectors into 1D and with a size supported by SPIR-V (2, 3 or 4 depending on the original dimension). This PR also includes new unit tests that only check for function signature conversion. ### Future Plans - Check for capabilities that support vectors of size 8 or 16. - Set up `OneToNTypeConversion` and `DialectConversion` to replace the current implementation that uses `GreedyPatternRewriteDriver`. - Introduce other vector unrolling patterns to cancel out the `vector.insert_strided_slice` and `vector.extract_strided_slice` ops and fully legalize the vector types in the function body. - Handle `func::CallOp` and declarations. - Restructure the code in `SPIRVConversion.cpp`. - Create test passes for testing sets of patterns in isolation. - Optimize the way original shape is splitted into target shapes, e.g. `vector<5xi32>` can be splitted into `vector<4xi32>` and `vector<1xi32>`. --------- Co-authored-by: Jakub Kuderski <kubakuderski@gmail.com>
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