Refac: Make all ops inline instead of static inline

[SwayamInSync]

ops.hpp was originally a C file, but got refactored into CPP implementation to use the templates (which indeed simplified a lot of code)
I noticed the functions are still declared with C style static inline (this leads each TU to own a private copy of that function) which is not desireable here (C's semantics of inline differ with C++). Switching all of them to just inline to allow linker to share those objects rather making private copies. Although most of the functions are small enough to be get inlined by the compiler anyway but this can help in debugging and will reduce some code bloat (2% on my machine) as we use these ops in multiple C++ TUs (see below)

Details

(quaddtype) ➜  numpy-quaddtype git:(code-bloat) ✗ rg "ops.hpp"                              
src/csrc/scalar_ops.cpp
17:#include "ops.hpp"

src/csrc/umath/unary_props.cpp
21:#include "ops.hpp"

src/csrc/casts.cpp
29:#include "ops.hpp"

src/csrc/umath/comparison_ops.cpp
21:#include "ops.hpp"

src/csrc/umath/matmul.cpp
22:#include "ops.hpp"

src/csrc/umath/binary_ops.cpp
20:#include "ops.hpp"

src/csrc/umath/unary_ops.cpp
21:#include "ops.hpp"

src/csrc/umath/umath.cpp
21:#include "ops.hpp"
(quaddtype) ➜  numpy-quaddtype git:(code-bloat) ✗ 

I proposed this earlier and one more time here, Ideally it'll be better to replace all explicit use of SLEEF routines to these ops abstractions (this will require porting the remaining C files C++) but will make the code more extendable.

[juntyr]

LGTM