fix: replace PatternType.getByIdentifier() with PatternTypeProvider

[1wairesd]

PatternType.getByIdentifier() causes IncompatibleClassChangeError on 1.19.4 due to a mismatch between Methodref and InterfaceMethodref bytecode constants when compiled against a newer API.

Introduce PatternTypeProvider with two implementations:

• LegacyPatternTypeProvider: iterates PatternType.values() for 1.19.4 and older where PatternType is still an enum
• ModernPatternTypeProvider: uses Registry.BANNER_PATTERN for 1.20.5+

Update MetaItemStack.addBannerMeta to resolve PatternType through the provider instead of calling the deprecated static method directly.

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[mbax]

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[1wairesd]

Information
This PR fixes #6553.

Details
Proposed fix: PatternType.getByIdentifier() is a static method on an interface (Keyed), but when EssentialsX is compiled against a newer Bukkit API and run on 1.19.4, the JVM throws IncompatibleClassChangeError because the bytecode expects a Methodref constant but finds an InterfaceMethodref (or vice-versa). The try/catch around the call only catches Exception, not Error, so the crash propagates.

The fix introduces a PatternTypeProvider interface with two implementations selected at runtime via the existing provider system:

LegacyPatternTypeProvider (weight 0) — iterates PatternType.values() and compares identifiers; works on 1.19.4 and older where PatternType is still an enum.
ModernPatternTypeProvider (weight 1) — uses Registry.BANNER_PATTERN.get(NamespacedKey.minecraft(...)) for 1.20.5+ where PatternType became a Registry-backed Keyed type.
MetaItemStack.addBannerMeta is updated to resolve PatternType through the provider instead of calling the deprecated static method directly.

Environments tested:

OS: Windows 10, Ubuntu 22.04

Java version: 21

Most recent Paper version (1.19.4, git-Paper-550)
CraftBukkit/Spigot/Paper 1.12.2
CraftBukkit 1.8.8
Demonstration:

Before (1.19.4):

[ERROR]: Command kit failed: java.lang.IncompatibleClassChangeError: Method
'org.bukkit.block.banner.PatternType
org.bukkit.block.banner.PatternType.getByIdentifier(java.lang.String)'
must be Methodref constant
at com.earth2me.essentials.MetaItemStack.addBannerMeta(MetaItemStack.java:745)
After: /kit with banner items works correctly on 1.19.4.