feat(GodotRust)!: Add godot-rust project support

[DragonAxe]

• Added GDExtension file generation.
      + Includes cargo support for locating cargo target directory.
      + Added [gdextension.<name>.GodotBevy] section to gdenv.toml. Supports generating multiple gdextension files at once to support multiple native extensions.
      + Support for additional gdextension generators can be added by adding new cases to SpecGdExtensionGenerator enum.

• Moved godot runner code into GodotRunner API:
      + Formalized runner API for use in cargo run scripts (run_godot.rs).
      + Runner is now testable with the help of command_runner.rs.
      + Added pre_import field to gdenv.toml to generate .godot directory for newly cloned projects.

• Fixed bug in installer.rs. install_version_from_archive return value did not return a path to the godot executable.

• 67% of all lines now have test coverage!
      + 81% for gdenv-lib.
      + <1% for gdenv.

[DragonAxe]

I also simplified the gdenv.toml gdextension configuration by removing the need for a crate_name field.

[DragonAxe]

I don't like how GodotRunner::build leaks the tokio dependency, requiring users of the library to use it. I'm looking for an alternate solution.

#[cfg(not(feature = "itest"))]
#[tokio::main]
async fn main() -> anyhow::Result<()> {
    gdenv_lib::api::godot_runner::GodotRunner::init()?
        .build().await?.execute()
}

[DragonAxe]

• Updated the README.
• Added gdenv schema command to generate documentation for a gdenv.toml file directly from rust-docs.

[DragonAxe]

I keep seeing this error in the Security Audit job:

Run dtolnay/rust-toolchain@stable
Run : parse toolchain version
Run : construct rustup command line
Run : set $CARGO_HOME
Run : install rustup if needed
info: downloading installer
error: could not amend shell profile: '/home/admin/.bash_profile': could not write rcfile file: '/home/admin/.bash_profile': Permission denied (os error 13)
Error: Process completed with exit code 1.

It goes away when I re-run the job. Seems like a Blaze server issue.