Implemented separate 'Moderator Event' tab as per Issue #200

[magge-faf]

This PR addresses Issue #200 by adding a separate 'Moderator Event' tab next to the 'Chat log'.

Changes include:

• Upgrade 'sourceCompatibility' from Java 17 to Java 21
• Upgrade 'commonsVersion' dependency to a new commit from faf-java-commons from commit deb598d to 6e46109
• Added a separate 'Moderator Event' tab next to 'Chat Log'
• Populating the tab 'Moderator Event' with its data
• Update readme for Java 21
• Refactor time formatting method for chat messages

These changes allow moderators to view moderator-specific events entirely separate from the chat log. Currently, it is very basic and more a "proof of concept", but it is a great start to be extended in the future.

Thanks for the detailed issue description @Garanas Thanks in advance for your code review @Brutus5000 or @Sheikah45

Fixes #200

Note: Player name is currently the raw represented focus army. I assume further changes to 'parseModeratorEvent' at faf-java-commons are needed to reference it to a player name. If the name can already be obtained from the current data, then please correct me.

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Result in UI:

[Garanas]

Note: Player name is currently the raw represented focus army. I assume further changes to 'parseModeratorEvent' at faf-java-commons are needed to reference it to a player name. If the name can already be obtained from the current data, then please correct me.

This is possible, we'll do that in the next iteration 😃 !