templates and build step for validating/submitting winget package (#6485)

.github/winget_templates/OpenAI.Codex.installer.yaml

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+PackageIdentifier: OpenAI.Codex
+PackageVersion: {{VERSION}}
+Installers:
+  - Architecture: x64
+    InstallerType: portable
+    InstallerUrl: https://github.com/openai/codex/releases/download/rust-v{{VERSION}}/codex-x86_64-pc-windows-msvc.exe
+    InstallerSha256: {{X64_SHA256}}
+    Commands:
+      - codex
+  - Architecture: arm64
+    InstallerType: portable
+    InstallerUrl: https://github.com/openai/codex/releases/download/rust-v{{VERSION}}/codex-aarch64-pc-windows-msvc.exe
+    InstallerSha256: {{ARM64_SHA256}}
+    Commands:
+      - codex
+ManifestType: installer
+ManifestVersion: 1.5.0

.github/winget_templates/OpenAI.Codex.locale.en-US.yaml

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+PackageIdentifier: OpenAI.Codex
+PackageVersion: {{VERSION}}
+PackageLocale: en-US
+Publisher: OpenAI
+PublisherUrl: https://github.com/openai
+PublisherSupportUrl: https://github.com/openai/codex/issues
+PrivacyUrl: https://openai.com/policies/privacy-policy
+PackageName: Codex
+PackageUrl: https://github.com/openai/codex
+License: Proprietary
+ShortDescription: Native Codex CLI (Rust) for terminal and TUI workflows.
+Moniker: codex
+Tags:
+  - codex
+  - cli
+  - ai
+  - agent
+ManifestType: defaultLocale
+ManifestVersion: 1.5.0

.github/winget_templates/OpenAI.Codex.yaml

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+PackageIdentifier: OpenAI.Codex
+PackageVersion: {{VERSION}}
+DefaultLocale: en-US
+ManifestType: version
+ManifestVersion: 1.5.0