[Runtime] Enhance PackedFunc Metaprogramming with PackArgs
#15595
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This PR introduces a convenient method `PackArgs` that allows packing
variadic C++ parameters into TVM's PackedFunc calling convention without
recursion using C++ parameter pack tricks.
As an example,
```C++
template <typename... Args>
void MyVariadicMethod(Args&&... args) {
constexpr int kNumArgs = sizeof...(Args);
TVMValue values[kNumArgs];
int type_codes[kNumArgs];
tvm::runtime::PackArgs(values, type_codes, std::forward<Args>(args)...);
...
}
```
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This PR introduces a convenient method
PackArgsthat allows packing variadic C++ parameters into TVM's PackedFunc calling convention without recursion using C++ parameter pack tricks.As an example,