feat: Replace dynamicXPMod setting with flexible experienceRateMin/Max

[HarleyGilpin]

feat: Replace dynamicXPMod setting with flexible experienceRateMin/Max

Removes the old world.dynamicXPMod option ("off", "linear", "inverse") in favor of a cleaner approach using world.experienceRateMin and world.experienceRateMax. This enables admins to:

• Set a fixed XP multiplier (by using equal min/max)
• Use level-based interpolation with increasing XP rates (min < max)
• Use level-based interpolation with decreasing XP rates (min > max)

This simplifies config while making the system more flexible.

[github-actions]

Qodana Community for JVM

It seems all right 👌

No new problems were found according to the checks applied

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[HarleyGilpin]

Commit was cherry picked already, PR is redundant. 90c7deb