feat(rdserver): adding Runescape: Dragonwilds game server

[yourfate]

Description

Adds the game server for the game Runescape: Dragonwilds.

Fixes #4891

Type of change

• Bug fix (a change which fixes an issue).
• New feature (a change which adds functionality).
• New Server (new server added).
• Refactor (restructures existing code).
• Comment update (typo, spelling, explanation, examples, etc).

Checklist

PR will not be merged until all steps are complete.

• This pull request links to an issue.
• This pull request uses the develop branch as its base.
• This pull request subject follows the Conventional Commits standard.
• This code follows the style guidelines of this project.
• I have performed a self-review of my code.
• I have checked that this code is commented where required.
• I have provided a detailed enough description of this PR.
• I have checked if documentation needs updating.

Documentation

If documentation does need updating either update it by creating a PR (preferred) or request a documentation update.

• User docs: https://github.com/GameServerManagers/LinuxGSM-Docs
• Dev docs: https://github.com/GameServerManagers/LinuxGSM-Dev-Docs

Thank you for your Pull Request!

[yourfate]

If anyone wants to complete this, feel free, I probably won't have time to work on this for a few months.

What is missing:

• query user for owner ID
• create server config file with owner ID
• fill world name / server name / port in config file from the values of the lgsm config somehow
• make sure to back up the server config file on updates, or write it from scratch on every start?