Summary:
When using this backend in a directory that is not a git repository, it will
search though all the file. This is mostly a problem when using an alternative
source control like sapling.
When using this backend neovim will just hang until the rg command is done.
When searching node_modules you can imagine how long that takes. This does not
actually fix the issue however, it does make it search though less files.
Test Plan:
This has been used manually on a sapling repo. I have also added
`--no-require-git` to most of the rg defaults in other applications.
`rg` will now be used over `ag` if it is available. This is because `rg`
is a faster alternative reduces lag when searching larger codebases.
`ag` is also now conditionally loaded if the command is available.
We now have a concept of a 'backend' this is the same as the current
sorters and finders but with added info like the keymap so they can all
be registered as one. This will allow us to split our backends into
modues so we can better maintain then.
