Heuristically identify git URL by matching the pattern
"git" in the domain.

Add a special case error with a fixit hint to help users
rerun the correct cargo install command

Create a local Error type that that wraps existing error handling code

Giving the three error variants names improves readability and
makes it easier to recognise duplicate code

Move all string operations to create errors from 3
separate bail! calls into anyhow::anyhow! calls
that are encapsulated in the From<> impl

This reverts commit 174c80e.

…om_git_error_message_alternative_impl

Add a test case for a git@ repo and refactor the method to
return Option<String> instead of bool.

Reword the suggestion to follow rustc guidelines

Make GitUrl parsing and normalisation defensive.

Create a type for InstallSuggestion and pass it to the
anyhow error message

…om_git_error_message_alternative_impl

Keep the dependency try the same by leveraging
already imported gix crate to try parsing
a git url from a string

Since I opened the PR, cargo started supporting `crate@version`
command-line inputs
rust-lang@2806270

and now the test input `git@bitbucket.org:jcmoyer/rust-tictactoe.git` is
parsed as a version string, which fails

the code path I added only deals with strings that weren't erroneously
parsed as version strings, so the section I highlighted above won't be
traversed, because `git@` strings now fail to parse as version strings
before they get here.

Delete the failing test