docs: add max_connection_age config to grpc server options (#2171)

Co-authored-by: LFC <[email protected]>

Author: Copilot

docs/user-guide/deployments-administration/configuration.md

@@ -184,6 +184,7 @@ The following table describes the options in detail:
 | grpc       |                      |         | gRPC server options                                                                                                                                                                                                                                                                                                                                                                        |
 |            | bind_addr            | String  | The address to bind the gRPC server, "127.0.0.1:4001" by default                                                                                                                                                                                                                                                                                                                           |
 |            | runtime_size         | Integer | The number of server worker threads, 8 by default                                                                                                                                                                                                                                                                                                                                          |
+|            | max_connection_age   | String  | Maximum lifetime of a gRPC connection that the server keeps it. Refer to ["MAX_CONNECTION_AGE"](https://grpc.io/docs/guides/keepalive/) for details. Defaults to not set. Example: "1h" for 1 hour, "30m" for 30 minutes |
 |            | flight_compression   | String  | Compression mode for frontend side Arrow IPC service. Available options: `none`: disable all compression, `transport`: only enable gRPC transport compression (zstd), `arrow_ipc`: only enable Arrow IPC compression (lz4), `all`: enable all compression. Default value is `none`.|
 | mysql      |                      |         | MySQL server options                                                                                                                                                                                                                                                                                                                                                                       |
 |            | enable               | Boolean | Whether to enable MySQL protocol, true by default                                                                                                                                                                                                                                                                                                                                          |

i18n/zh/docusaurus-plugin-content-docs/current/user-guide/deployments-administration/configuration.md

@@ -174,6 +174,7 @@ enable = true
 | grpc       |                    |        | gRPC 服务器选项                                              |
 |            | bind_addr               | 字符串 | gRPC 服务绑定地址，默认为 "127.0.0.1:4001"                          |
 |            | runtime_size       | 整数   | 服务器工作线程数量，默认为 8                                 |
+|            | max_connection_age   | 字符串  | gRPC 连接在服务端保持的最长时间。参见 ["MAX_CONNECTION_AGE"](https://grpc.io/docs/guides/keepalive/)。默认不设置。示例："1h" 表示 1 小时，"30m" 表示 30 分钟 |
 |            | flight_compression   | 字符串  | Frontend 的 Arrow IPC 服务的压缩模式。可用选项：`none`：禁用所有压缩，`transport`：仅启用 gRPC 传输压缩（zstd），`arrow_ipc`：仅启用 Arrow IPC 压缩（lz4），`all`：启用所有压缩。默认值为 `none`。|
 | mysql      |                    |        | MySQL 服务器选项                                             |
 |            | enable             | 布尔值 | 是否启用 MySQL 协议，默认为 true                             |