Install josh binaries into a local directory

[Kobzol]

This PR changes josh-sync so that it install josh binaries into a .josh-sync/cargo directory in the user's HOME directory, to avoid clashing with global Cargo installed binaries.
It also shows the installation progress, to avoid a long duration without any output.

It still installs the commands globally on CI, to make more effective use of caching (via rust-cache).

Fixes: #50

[tgross35]

Could this be in ~/.local/bin/josh-sync/ or similar? To avoid some home directory pollution

[Kobzol]

That would be this, right? I don't just want to hardcode it for Linux :P

[tgross35]

I was thinking this one https://docs.rs/dirs/latest/dirs/fn.executable_dir.html but maybe data dir is better since this needs a subdirectory. The same ~/.local directory should be fine on Mac and Windows too, at least I have a number of CLI utils that opted for that.

Or configurable via env would be fine, just preferably some way to avoid a new top-level directory in ~ :)

[Kobzol]

I wanted to avoid depending on a new dependency, only to find out that we already depend on directories 😆 So I just used its data local directory.

[Kobzol]

Seeing as there was no additional feedback in the meantime, I'll merge this.