Add vector::insert for iterator range [first, last)

[Copilot]

Implements missing vector::insert(const_iterator pos, InputIt first, InputIt last) method for kf::vector to enable range insertion.

Changes

Implementation (include/kf/stl/vector)

• Added template method accepting InputIterator range [first, last)
• Uses std::distance to calculate element count for pre-allocation via reallocateGrowth
• Returns std::optional<iterator> (nullopt on allocation failure)
• Added #include <iterator> for std::distance

Tests (test/Vector.cpp)

• Insert range from array/vector into empty vector
• Insert range at beginning/middle/end of populated vector
• Insert empty range (edge case)

Usage

kf::vector<int, PagedPool> v;
REQUIRE_NT_SUCCESS(v.push_back(1));
REQUIRE_NT_SUCCESS(v.push_back(5));

int arr[] = {2, 3, 4};
auto iter = v.insert(v.begin() + 1, std::begin(arr), std::end(arr));
// v is now [1, 2, 3, 4, 5]

Original prompt

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This section details on the original issue you should resolve

<issue_title>Add vector::insert for a range [first, last)</issue_title>
<issue_description>- Implement a missing method in kf::vector: iterator insert(const_iterator pos, InputIt first, InputIt last).

• Look how other methods are implemented and follow the same principle.
• Note: it's a widows kernel-mode code, so it doesn't support C++ exceptions.
• Add a test for the new method (look for existing tests and do the same).</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Add vector::insert for a range [first, last) #90

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