Add support for palantir-java-format

[Machine-Maker]

Closes #1

[lukebemish]

Thank you! One question I have -- how much of a fork, exactly, is the palantir java formatter? The wrapper and step involved there look really similar to that for the google formatter; is there any reason they can't share the same code in some places?

[lukebemish]

On the flip side, it's also not that much code so no huge deal if there's some duplication, if combining stuff would introduce more complexity than it solves.

[Machine-Maker]

Yeah, I thought about trying to re-use code, but it's really not a lot of code and if it ever does need to be different, maybe its better to just be separate.

[lukebemish]

Fair enough. Lemme test it locally in the next few days, then I'll merge it. Thanks again for the contribution!