docs: add max_connection_age config to grpc server options

[Copilot]

This PR adds documentation for the new max_connection_age configuration option for gRPC server, which was introduced in GreptimeTeam/greptimedb#7031.

What Changed

Added the max_connection_age configuration parameter to the gRPC server options in the configuration documentation. This option allows users to control the maximum lifetime of gRPC connections before the server gracefully closes them.

Configuration Details

• Type: String (duration format)
• Default: Not set (connections remain open indefinitely)
• Purpose: Controls the maximum age of a gRPC connection before graceful closure
• Examples:
  • "1h" for 1 hour
  • "30m" for 30 minutes

Documentation Updated

The configuration has been documented in:

• Current English documentation
• Version 0.17 English documentation
• Current Chinese (中文) documentation
• Version 0.17 Chinese (中文) documentation

This ensures consistency across all supported versions and languages.

Use Case

This configuration is useful for:

• Preventing connection leaks in long-running services
• Managing connection lifecycle in load-balanced environments
• Implementing connection rotation policies for security or operational requirements

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• googlechromelabs.github.io
  • Triggering command: node install.mjs (dns block)
• https://api.github.com/repos/GreptimeTeam/greptimedb/pulls/7031
  • Triggering command: curl -s REDACTED (http block)
• https://storage.googleapis.com/chrome-for-testing-public/140.0.7339.82/linux64/chrome-headless-shell-linux64.zip
  • Triggering command: node install.mjs (http block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

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This section details on the original issue you should resolve

<issue_title>Update docs for feat: add max_connection_age config to grpc server</issue_title>
<issue_description>A document change request is generated from GreptimeTeam/greptimedb#7031</issue_description>

Comments on the Issue (you are @copilot in this section)

Fixes #2151

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