feat: add entity equipment, effects, and attributes to spawner

[lonelyicer]

No description provided.

[github-actions]

Game Test Results

✅ Success

Metric	Value
Total Tests	1
Passed	1
Failed	0
Duration	352.8 ms

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Workflow run: #281

[Copilot]

Pull request overview

This PR adds comprehensive entity customization capabilities to the trial spawner system, allowing spawned entities to be equipped with items, given potion effects, and have their attributes modified.

Key changes:

• Introduces a builder pattern (EntityTableBuilder) for fluent configuration of entity equipment, effects, and attributes
• Adds JSON serialization/deserialization support for the new entity configuration options
• Implements application logic to equip mobs with items, apply potion effects, and modify attributes when spawned

Reviewed changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/main/java/com/altnoir/mia/datagen/MiaTrialSpawnerProvider.java	Adds example usage demonstrating the new entity builder API with equipped zombies and skeletons
src/main/java/com/altnoir/mia/core/spawner/records/EntityTableInstance.java	Extends the entity table record to store equipment, effects, and attribute modifiers
src/main/java/com/altnoir/mia/core/spawner/AbyssTrialSpawnerManager.java	Implements JSON parsing logic for equipment, effects, and attribute modifiers
src/main/java/com/altnoir/mia/core/spawner/AbyssTrialSpawnerDataProvider.java	Adds EntityTableBuilder class with fluent API for entity configuration and JSON serialization support
src/main/java/com/altnoir/mia/core/spawner/AbyssTrialSpawner.java	Implements applyEntityConfiguration method to apply equipment, effects, and attributes to spawned mobs
src/generated/resources/data/mia/mia/trial_spawner/example_equipped_zombie.json	Generated JSON configuration file for the equipped zombie example

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