fix constructor order, friend class, inconsistent function, inconsistent class/struct

[yhmtsai]

From #1675 , we can not use clang-cl on windows to build ginkgo (maybe only static build, not sure the shared build)
The reason is the inconsistence between the declaration and declaration of definition.
For example,
We declare void func(int *a);, which is seen by ginkgo_core. We also use it to instantiate the function.
However, we implement it like void func(int *const a) {...}.
The symbol in the library from clang-cl will use void func(int *const a) not void func(int *a).
core only know void func(int *a) such that it can not find the symbol properly although the int* a should be fit into int* const a

More than that, I also fix the constructor order is different from the data member order, microsoft does not like the friend class without namespace not in the nearest namespace, and inconsistent class/struct.

also, add some tricks to avoid alais undeclared in the a structure which is in another tempalted structure.
It is mentioned in llvm/llvm-project#64996
we use using .. = .. in the nested struct as workaround here

[upsj]

LGTM! Great catch, I would have thought that -Wreorder can catch some of these issues, and I must have missed the name mangling capturing parameter const-ness.

[yhmtsai]

I found the const-ness issue by lucky. I do not have an idea that any tool can help detecting this situation.