Switch to closest file configuration resolution

[JohnnyMorganz]

Right now, stylua will only look for a stylua.toml file in the current working directory (and, if --search-parent-directories is specified, then any ancestor directories of the cwd).

This means configuration files in sub directories is not supported.

For example, in the following set up:

stylua.toml
src/
    test.lua
    foo/
        stylua.toml
        action.lua

stylua src/ will only use the configuration from the cwd, and will not apply src/foo/stylua.toml when formatting src/foo/action.lua.

This PR changes this to support looking up configuration in subdirectories.

For a given file (e.g., src/foo/action.lua), we continue searching upwards in the ancestry for stylua.toml. If we reach the current working directory, we stop searching any further (unless --search-parent-directories was specified). In this case, we would search for src/foo/stylua.toml, src/foo/stylua.toml, and stylua.toml, then stop.

Closes #831, and Fixes #915

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