[MC-275200] Nested selector component separators stall server

The following component will (pretty much) indefinitely stall the netty thread/component rendering by making the separator of the entity list a selector with a seperator of... and so on

tellraw @a {"selector":"@e","separator":{"selector":"@e","separator":{"selector":"@e","separator":{"selector":"@e","separator":{"selector":"@e","separator":{"selector":"@e","separator":{"selector":"@e","separator":{"selector":"@e","separator":{"selector":"@e","separator":{"selector":"@e","separator":{"selector":"@e","separator":{"selector":"@e","separator":{"selector":"@e","separator":{"selector":"@e","separator":{"selector":"@e","separator":{"selector":"@e","separator":{"selector":"@e","separator":{"selector":"@e","separator":{"selector":"@e","separator":{"selector":"@e","separator":{"selector":"@e","separator":{"selector":"@e","separator":{"selector":"@e","separator":{"selector":"@e"}}}}}}}}}}}}}}}}}}}}}}}}

The report we got had this component in text display entity text, which will also render the component. I believe a non-op client with creative mode would be able to spawn such a text display through a spawn egg, the actual item and entity data could look as follows:

minecraft:bat_spawn_egg[entity_data={id: "minecraft:text_display", text: '{"selector":"@e","separator":{"selector":"@e","separator":{"selector":"@e","separator":{"selector":"@e","separator":{"selector":"@e","separator":{"selector":"@e","separator":{"selector":"@e","separator":{"selector":"@e","separator":{"selector":"@e","separator":{"selector":"@e","separator":{"selector":"@e","separator":{"selector":"@e","separator":{"selector":"@e","separator":{"selector":"@e","separator":{"selector":"@e","separator":{"selector":"@e","separator":{"selector":"@e","separator":{"selector":"@e","separator":{"selector":"@e","separator":{"selector":"@e","separator":{"selector":"@e","separator":{"selector":"@e","separator":{"selector":"@e","separator":{"selector":"@e"}}}}}}}}}}}}}}}}}}}}}}}}'}]