[dpembo]

Summary

• Add database-configuration.max-lifetime, in seconds, and pass it to Sarah as the Hikari connection max lifetime. Depends on GroupeZ-dev/Sarah#24, which adds DatabaseConfiguration.withMaxLifetime.
• 1800 keeps the current 30-minute behavior. 0 keeps connections until the pool closes. A missing or negative value leaves Sarah's 30-minute default in place.
• The shared database-configuration.yml overrides the plugin config, same as the other database settings. Sarah is bumped to 1.26. in the PR

This only affects MySQL and MariaDB. SQLite does not use the pool. Hikari rejects any positive lifetime under 30 seconds. This pull request will not build until Sarah 1.26 is published.

Test plan

• With MySQL or MariaDB, max-lifetime: 1800 connects and behaves like the previous 30-minute lifetime.
• Setting a shorter lifetime, such as 60, is accepted by the pool.
• max-lifetime: 0 leaves connections open until the pool closes.
• A value under 30 seconds is rejected by Hikari.
• Omitting the key, including from an existing config.yml, still uses 30 minutes.
• A value in the shared database-configuration.yml overrides the plugin config.
• SQLite storage still connects.