Support GitHub and GitLab URLs

[SamuelSarle]

Supports fetching a single file given git://<host>/<owner>/<repo>/<branch_or_commit>/<path>.

$ cargo run -q -- git://github.com/dryrust/gofer.rs/master/VERSION
0.1.4

$ cargo run -q -- git://github.com/dryrust/gofer.rs/f4ea4a585c009aefd570cefcb6062dc5d579c6ab/VERSION
0.1.4

$ cargo run -q -- git://gitlab.com/rust-lang/rust/master/src/version
1.89.0

$ cargo run -q -- git://gitlab.com/rust-lang/rust/c6a955468b025dbe3d1de3e8f3e30496d1fb7f40/src/version
1.89.0

Closes #3

[artob]

@race-of-sloths invite

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[Copilot]

Pull Request Overview

Adds support for the git:// URL scheme by mapping GitHub and GitLab git URLs to their raw content endpoints and fetching them via reqwest.

• Implements open() for git:// URLs in lib/gofer/src/schemes/git.rs, including URL mapping and HTTP GET.
• Introduces a new InvalidGitUrl error variant and conversion in lib/gofer/src/error.rs.
• Updates Cargo features (enables git by default) and provides a usage example in lib/gofer/examples/git.rs.

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
lib/gofer/src/schemes/git.rs	Implement open() and map_git_url_to_raw_url, add tests
lib/gofer/src/error.rs	Add InvalidGitUrl error variant and From<Error> case
lib/gofer/examples/git.rs	New example demonstrating git:// usage
lib/gofer/Cargo.toml	Enable git in feature sets and adjust dependencies

Comments suppressed due to low confidence (3)

lib/gofer/src/schemes/git.rs:19

• [nitpick] The variable client refers to a ClientBuilder, not the final Client. Consider renaming it to builder to clarify its role before calling .build().

let client = ClientBuilder::new()

lib/gofer/src/schemes/git.rs:79

• Add negative tests for map_git_url_to_raw_url, e.g. invalid prefixes, too few components, or unsupported hosts, to verify proper error handling.

mod test {

lib/gofer/examples/git.rs:1

• Include a comment or README note that the git feature must be enabled when running this example (e.g. cargo run --example git --features git).

// This is free and unencumbered software released into the public domain.

[artob]

LGTM. Good work!

[race-of-sloths]

🥁 Score it!

@artob, please score the PR with @race-of-sloths score [1/2/3/5/8/13]. The contributor deserves it.
If no scoring is provided within 24 hours, this PR will be scored as 2 🦥