[rishabhvenu]

Fixes #591

The Fabric and Forge jars relocate adventure to me.lucko.spark.lib.adventure, but the two adventure service files are copied as they are:

META-INF/services/net.kyori.adventure.text.event.DataComponentValueConverterRegistry$Provider
    -> net.kyori.adventure.text.serializer.gson.impl.GsonDataComponentValueConverterProvider
META-INF/services/net.kyori.adventure.text.serializer.json.JSONComponentSerializer$Provider
    -> net.kyori.adventure.text.serializer.gson.impl.JSONComponentSerializerProviderImpl

Those provider classes do not exist under that name in the jar, so any other mod that loads the real adventure services finds spark's entry and fails with ServiceConfigurationError: ... Provider ... not found, which is the PacketEvents crash in the issue.

The NeoForge build already has mergeServiceFiles() for this (#460), which makes shadow relocate the service files too. This adds the same line to the Fabric and Forge shadowJar tasks.

Checked

Built the jars from master and from this branch and listed META-INF/services:

Jar	Service files
Fabric, master	net.kyori.adventure... pointing at net.kyori.adventure...gson.impl... (same as the published 1.10.187 jar)
Fabric, this branch	me.lucko.spark.lib.adventure... pointing at me.lucko.spark.lib.adventure...gson.impl..., which exist in the jar
Forge, published 1.10.187	same unrelocated files as Fabric
Forge, this branch	relocated, as above

After the change both jars match what the NeoForge jar already ships.

Then booted a Fabric 26.3 dedicated server (loader 0.19.5, fabric-api 0.162.0) with packetevents-fabric-2.14.0:

Mods	Result
PacketEvents only	boots
PacketEvents + spark built from master	exits during startup with ServiceConfigurationError: net.kyori.adventure.text.event.DataComponentValueConverterRegistry$Provider: Provider net.kyori.adventure.text.serializer.gson.impl.GsonDataComponentValueConverterProvider not found
PacketEvents + spark built from this branch	boots, spark loads

Not covered: I did not boot a Forge server; for Forge I only compared the jar contents.