Fix container display syncing on late joining clients

[Sjerty]

[WIP]

Summary

PR checklist

• [x] The game builds properly without errors.
• [x] No unrelated changes are present.
• [x] No "trash" files are committed.

Testing

Host and late join as a client.

Networking checklist

• [ ] Works from host in host mode.
• [ ] Works from server in server mode.
• [ ] Works on server in client mode.
• [ ] Works and is syncronized across different clients.
• [ ] Is persistent.

Changes

Changed Start() to Awake() in ContainerItemDisplay.cs, so the listeners could subscribe before the any events happen.

closes #1232

[Sjerty]

Tried to make pivots by hand, instead in Instantiating them in code, almost works fine... Sometimes the client is still spawns with items in the ground, but the host ones from client perspective is fine, still trying to understand why

Also the "Transform[] Displays" in AttachmentContainer.cs not synced for late join, so the first drop of an item is broken. Video: https://www.youtube.com/watch?v=fNmeHWaF8es

[stilnat]

good work, thanks !