fancyholograms: Add support for pre-1.19.4 clients

[Maks1116]

📋 Description

ViaBackwards cannot correctly translate multi-line text displays for clients older than 1.19.4 (see ViaVersion/ViaBackwards#1029). This adds a workarround that spawns multiple single-line text displays for legacy clients instead, which ViaBackwards can translate correctly.

✅ Checklist

• My code follows the project's coding style and guidelines
• I have tested my changes locally and they work as expected
• I have added necessary documentation (if applicable)
• I have linked related issues using Fixes #issue_number or Closes #issue_number
• I have rebased/merged with the latest main branch

🔍 Changes

When ViaVersion is detected and a player connects with a pre-1.19.4 client, text holograms are rendered as separate single-line displays.

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🧪 How to Test

1. Create a test server with FancyHolograms, ViaVersion and ViaBackwards.
2. Create a multi-line hologram on the server.
3. Test with clients older and newer than 1.19.4.

[Rabusek]

This would be awesome to get