Support adding custom paths for the following git config:

# Anonymous user override[includeIf "hasconfig:remote.*.url:**/**github.com*/**"]path = ~/.personal.gitconfig

According to the documentation:

As for the naming of this keyword, it is for forwards compatibility with a naming scheme that supports more variable-based include conditions, but currently Git only supports the exact keyword described above.

So I have matched the condition exactly word to word withhasconfig:remote.*.url. I then go over the list of remotes and find usingfnmatchcase the correct remote (not sure iffnmatch.

Maybe a list of open points here:

• I'm not sure if the wildcard format and the fnmatch function are equivalent. Is it necessary to match these two 100%? Maybe a maintainer would have more experience with
• Should I write more test cases?
• Write a couple of cases which are handled by both git binary and gitpython and compare the two.

Closes#2017