Add support for range assign and insert for input iterator

[winner245]

This patch addresses the issue where range assignment and insertion for vector did not support input iterators. With this update, both range assignment and insertion now fully support iterators of the input iterator category. New tests have been added to validate the correctness of the code, and all existing tests have passed successfully. With the prior PR #160 adding support for input iterators for the constructor of vector, this PR extends that support to both range assignment and range insertion.

[Peas-Li]

大佬，我问你一个问题：
#include
using namespace std;
template
class B
{
B(){
const int a = 1;
const T b = a;
}
};
int main()
{
B<int&> v;
return 0;
}
报错error: binding reference of type 'int&' to 'const int' discards qualifiers
为什么

[Peas-Li]

可以看一下issue里面第一个我的提问吗，实在是不理解，谢谢啦

[winner245]

报错信息不是已经很清楚了吗？int& b = const_a; 这样的初始化有问题。类模板中 const T b = a; 的 const 是施加给 T 的 top-level const 属性，不是 low-level const。你换成 B<const int&> v; 试试