request: allow passing -X <strategy-option> to git checkout <path> to auto-solve merge conflicts

[Andrey Butirsky <butirsky@gmail.com>]

Hi, stumbling upon this again and again, so decided to write finally,

while in conflicting state, the only thing we can do to auto-pick one or 
another side of conflict is passing --ours/--theirs option to git-checkout:
git checkout --ours/--theirs <path>

The problem is - it doesn't actually do a _merge_, i.e. you lose all 
non-conflicted changes.

There is no easy way to solve that currently without third-party tools.

This link illustrates it:
https://stackoverflow.com/a/68498101/1063363

Proposal:
Shell we add -X <strategy-option> to git checkout <path> to allow it do 
a merge and _actually solve_ merge conflicts?
That would be in-pair with other commands taking the option already: 
git-merge, git-rebase, (etc.?)