Refactor debugger and byond-tracy init (#90288)

## About The Pull Request

This refactors code related to debugger and byond-tracy
`/datum/debugger` and `/datum/tracy` - which live in the `GLOBAL_REAL`
vars `Debugger` and `Tracy` respectively.

This allows code related to those two to be grouped together in their
own files, rather than mashed into `world.dm` with a bunch of other shit
- while it still initializes during the same stages of init.

In addition, this also ports
https://github.com/BeeStation/BeeStation-Hornet/pull/8947, which prints
runtime errors to chat when the debugger is enabled.

<details>
<summary><h3>Proof of Testing</h3></summary>

![2025-03-27 (1743094986) ~
Code](https://github.com/user-attachments/assets/2678542f-8338-4ca8-9435-e0376da9e80a)
![2025-03-27 (1743095425) ~
Code](https://github.com/user-attachments/assets/35a1c454-c176-4fb9-987b-82eb92f0fd31)
![2025-03-27 (1743095936) ~
dreamseeker](https://github.com/user-attachments/assets/49f607dc-c684-4fd9-8271-a287f2341c52)
![2025-03-27 (1743096001) ~
Code](https://github.com/user-attachments/assets/8cca692c-6253-48e8-9994-beff39211078)
![2025-03-27 (1743096351) ~
dreamseeker](https://github.com/user-attachments/assets/43a993dd-3884-4709-94fc-d072ff97a337)

</details>

## Why It's Good For The Game

Reduces some `GLOB` pollution, and groups a bunch of related code into
dedicated files and datums.
It's simply cleaner.

Printing runtime errors to chat is also very useful, as it allows you to
see when shit is fuck, if you don't want a breakpoint pause for each
error.

## Changelog
🆑
refactor: Refactored some code related to initialization.
code: Runtime errors will now print to the chat while debugging.
/🆑

code/modules/error_handler/error_handler.dm

@@ -146,6 +146,8 @@ GLOBAL_VAR_INIT(total_runtimes_skipped, 0)
 		GLOB.current_test.Fail("[main_line]\n[desclines.Join("\n")]", file = E.file, line = E.line)
 #endif
 
+	if(Debugger?.enabled)
+		to_chat(world, span_alertwarning("[main_line]"), type = MESSAGE_TYPE_DEBUG)
 
 	// This writes the regular format (unwrapping newlines and inserting timestamps as needed).
 	log_runtime("runtime error: [E.name]\n[E.desc]")