feat: 🎸 add GitHub CLI

gh/README.md

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+# GitHub CLI plugin
+
+[GitHub CLI](https://docs.github.com/ja/github-cli/github-cli/about-github-cli) plugin for [proto](https://github.com/moonrepo/proto).
+
+## Installation
+
+This is a community plugin and is thus not built-in to proto. In order to use it, first either add it to your global or project-based `.prototools` by running:
+
+### Global install
+
+```shell
+proto plugin add gh "source:https://raw.githubusercontent.com/appthrust/proto-toml-plugins/main/gh/plugin.toml" --global
+proto install gh
+```
+
+### Per-project install
+
+```shell
+proto plugin add gh "source:https://raw.githubusercontent.com/appthrust/proto-toml-plugins/main/gh/plugin.toml"
+proto pin gh latest --resolve
+```

gh/plugin.toml

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+# A TOML plugin for GitHub CLI:
+# https://moonrepo.dev/docs/proto/plugins#toml-plugin
+
+name = "GitHub CLI"
+type = "cli"
+
+[platform.linux]
+bin-path = "gh_{version}_linux_{arch}/bin/gh"
+download-file = "gh_{version}_linux_{arch}.tar.gz"
+checksum-file = "gh_{version}_checksums.txt"
+
+[platform.macos]
+bin-path = "gh_{version}_macOS_{arch}/bin/gh"
+download-file = "gh_{version}_macOS_{arch}.zip"
+checksum-file = "gh_{version}_checksums.txt"
+
+[platform.windows]
+bin-path = "gh_{version}_windows_{arch}/bin/gh.exe"
+download-file = "gh_{version}_windows_{arch}.zip"
+checksum-file = "gh_{version}_checksums.txt"
+
+[install]
+download-url = "https://github.com/cli/cli/releases/download/v{version}/{download_file}"
+
+[install.arch]
+aarch64 = "arm64"
+x86_64 = "amd64"
+x86 = "386"
+
+[resolve]
+git-url = "https://github.com/cli/cli"