feat(api): allow Device Authorization Grant using custom login UI (#9387)

# Which Problems Are Solved

The OAuth2 Device Authorization Grant could not yet been handled through
the new login UI, resp. using the session API.
This PR adds the ability for the login UI to get the required
information to display the user and handle their decision (approve with
authorization or deny) using the OIDC Service API.

# How the Problems Are Solved

- Added a `GetDeviceAuthorizationRequest` endpoint, which allows getting
the `id`, `client_id`, `scope`, `app_name` and `project_name` of the
device authorization request
- Added a `AuthorizeOrDenyDeviceAuthorization` endpoint, which allows to
approve/authorize with the session information or deny the request. The
identification of the request is done by the `device_authorization_id` /
`id` returned in the previous request.
- To prevent leaking the `device_code` to the UI, but still having an
easy reference, it's encrypted and returned as `id`, resp. decrypted
when used.
- Fixed returned error types for device token responses on token
endpoint:
- Explicitly return `access_denied` (without internal error) when user
denied the request
  - Default to `invalid_grant` instead of `access_denied`
- Explicitly check on initial state when approving the reqeust
- Properly handle done case (also relates to initial check) 
- Documented the flow and handling in custom UIs (according to OIDC /
SAML)

# Additional Changes

- fixed some typos and punctuation in the corresponding OIDC / SAML
guides.
- added some missing translations for auth and saml request

# Additional Context

- closes #6239

---------

Co-authored-by: Tim Möhlmann <tim+github@zitadel.com>

internal/static/i18n/zh.yaml

@@ -543,6 +543,7 @@ Errors:
     AlreadyExists: AuthRequest已经存在
     NotExisting: AuthRequest不存在
     WrongLoginClient: 其他登录客户端创建的AuthRequest
+    AlreadyHandled: 身份验证请求已被处理
   OIDCSession:
     RefreshTokenInvalid: Refresh Token 无效
     Token:
@@ -553,8 +554,12 @@ Errors:
     AlreadyExists: SAMLRequest 已存在
     NotExisting: SAMLRequest不存在
     WrongLoginClient: 其他登录客户端创建的 SAMLRequest
+    AlreadyHandled: SAML请求已被处理
   SAMLSession:
     InvalidClient: 未向该客户端发出 SAMLResponse
+  DeviceAuth:
+    NotFound: 设备授权请求不存在
+    AlreadyHandled: 设备授权请求已被处理
   Feature:
     NotExisting: 功能不存在
     TypeNotSupported: 不支持功能类型