Template CSR4MPI for multi-scalar type support without recompilation

[Copilot]

Eliminates the CSR4MPI_VALUE_TYPE compile-time switch by converting all classes to C++ templates. All four scalar types (float, double, complex, complex) are now available simultaneously in a single library build.

Changes

• Templated classes (now header-only):

  • cCSRMatrix<Scalar>, cCommPattern<Scalar>, cRemoteEntry<Scalar>
  • cCSRComm<Scalar>, cMumpsAdapter<Scalar>

• Templated operations:

  • SpMV<Scalar>(), SpMM<Scalar>(), SpMMBlas<Scalar>()
  • LoadMatrixMarket<Scalar>(), DistributedSpMV<Scalar>()

• Type support in Global.h:

  • Type traits: is_complex_v<T>, is_supported_scalar_v<T>, real_type_t<T>
  • Shared MPI helper: mpi_helper::GetMPIDatatype<Scalar>()

• Convenience aliases:

  • cCSRMatrixF, cCSRMatrixD, cCSRMatrixCF, cCSRMatrixCD

Usage

// All types available without recompilation
cCSRMatrix<double> matD(0, n, n, rowPtr, colInd, values);
cCSRMatrix<std::complex<float>> matCF(...);

std::vector<double> x(n, 1.0), y;
SpMV(matD, x, y);

Tests

Added test_all_scalar_types.cpp with typed tests covering all 4 scalar types (52 tests total).

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Original prompt

指定计划，实现如下目标：将四种数据类型 （float, double, complex, complex）同时编译进库文件，可以的话，头文件模板化，去除对 DCSR4MPI_VALUE_TYPE 的依赖，避免切换类型重新编译。几种数据类型都要进行充分的测试验证

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