<xutility>, <algorithm>: Add top level const on pointer parameters

[KamathScience]

Closes #4385

This PR adds the top-level const to the _Ty* _First, _Ty* _Last parameters for the following functions
<algorithm> : __std_minmax_element, __std_minmax
<xutility>: __std_find_trivial_unsized, __std_min, __std_max

[KamathScience]

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[frederick-vs-ja]

Changes for following functions still seem missing:

In <xutility>:

• __std_count_trivial
• __std_find_trivial
• __std_min_element
• __std_max_element

In <algorithm>:

• __std_find_last_trivial

[StephanTLavavej]

Looks great, thanks! We merge PRs simultaneously to the MSVC-internal and GitHub repos in a semi-manual process, batching up PRs to save time. Your PR will be part of the next batch, likely later this week - I'll post comments as I mirror the PRs and then finally merge 'em.

[KamathScience]

Thank you all, this process has been incredibly smooth for me!

[StephanTLavavej]

I'm mirroring this to the MSVC-internal repo - please notify me if any further changes are pushed.

[StephanTLavavej]

Thanks again, and congratulations on your first microsoft/STL commit! 🎉 🥳 😸

This is expected to ship in VS 2022 17.10 Preview 3, and has been recorded in the STL Changelog.