Add cli overrides

[Darunada]

fixes #69

This adds support for overriding pkg-url, bin-path, and pkg-format using cli arguments of the same name.

For example, to install Just, which doesn't follow the standard format:

cargo binstall --pkg-url="{ repo }/releases/download/{ version }/{ name }-{ version }-{ target }.{ format }" --pkg-fmt="tar.gz" --bin-path="{name}" --target=x86_64-unknown-linux-musl just

I also applied a couple of clippy recommendations and added support for tar.gz

[ryankurte]

howdy, thanks for the PR, seems like a reasonable improvement!

the other thing i had thought might be useful for this case is to perform the crate lookup, find the repository, then to hit the GH API to scrape the repository for binaries associated with the version from the cargo file (which would lead to supporting installation from github URLs and versions too).

FYI we'll probably try to change the names of these fields in a backwards-compatible-for-metadata way in the near future but the CLI args might change names to match.

[Darunada]

Thanks! Using the github api seems like a no-fuss method of doing it. This method would allow downloading from hypothetically any location using the correct url template, which I thought was interesting.

I am happy to change the names of the params to whatever you think might be appropriate before merging.

[passcod]

(Hi! I'm a new maintainer 👋🏻)

Could you split the "support for targz" away? Tar + Gzip is already supported (I think there should be a better way to deal with .tar.gz == .tgz and .tar.xz == .txz etc, but probably not by adding redundant variants).

[passcod]

Superseded by #147