Add configuration option for MiniMessage-formatted MOTD

[wordandahalf]

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This closes #8230 by adding a new configuration option at messages.motd in paper-global.yml that overrides the value of motd in server.properties if it exists.

This is my first contribution, so please let me know if there is anything that I can change; I feel like there may have been some curfuffling in the process of rebuilding of the patches, but it functioned as expected when I tested.

Thanks!

[Doc94]

Welcome to the world of PR :3 For config things you need add to the patch related to config like mention the contribution files https://github.com/PaperMC/Paper/blob/master/CONTRIBUTING.md#committing-changes and then make another patch for your changes (if im not wrong...)

[wordandahalf]

For config things you need add to the patch related to config like mention the contribution files https://github.com/PaperMC/Paper/blob/master/CONTRIBUTING.md#committing-changes and then make another patch for your changes (if im not wrong...)

Thanks for that, I managed to miss that tidbit.

[wordandahalf]

I've (hopefully) fixed up the configuration commit. I've noticed that my patch numbers do not correspond with the existing numbering. Is that an issue?

[Owen1212055]

This can be fixed by applying patches and rebuilding.

In general, I see why the whole "null" is a little bit iffy. What if we had a new type that represented an "override"? Basically, if motd was equal to unset this would cause it to use the default vanilla server properties.

This might be a useful type in general if we want to move more things to use adventure like this.