bug#68697: Add option to not always use *grep* buffer when executing `grep' or `vc-git-grep' command

[Nafiz Islam <nafiz.islam1001@gmail.com>]

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The way `grep' and `vc-git-grep' works right now is that it will always
output its result to a buffer called `*grep*'. So, if I perform another
`grep' command, it will overwrite the previous grep result (unless I rename
the buffer beforehand).

I would like, at least, an option to create a new buffer each time a `grep'
command is executed. Maybe each new buffer could be given the name based on
the regexp or the grep shell command used.

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