Support named config file

[schusj]

Closes 760 (no, does not)

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[nene]

Thanks.

Looks like a nice little addition. I've added a few small comments, feel free to fix them if you feel like it. Otherwise I'll merge it as-is.

I should also point out that this does not actually resolve issue #760. That one is about VSCode extension, but the logic in bin/sql-formatter-cli.cjs is used only by the sql-formatter command line tool and won't in any way impact the VSCode extension which only uses the sql-formatter library (source of which resides in src/ dir).

[schusj]

Oh okay, I use the CLI with neovim and just assumed #760 was related / could be solved with this. Have resolved your comments.

[nene]

This is now released in 15.4.0