Absorb pocketmine/log-pthreads into PM core

this was previously part of the abandoned package pocketmine/spl. It had to be separated in the PM3 days, because RakLib depended on it.

Since RakLib 0.13, RakLib stopped being dependent on or aware of pthreads, so it no longer depends on any thread-related packages.
It's also possible to absorb pocketmine/snooze and pocketmine/classloader back into the core with this in mind.

composer.lock

@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "507c2a45350440a7717ed089190fe4f0",
+    "content-hash": "0dc836612512d87a694945ffb87a4096",
     "packages": [
         {
             "name": "adhocore/json-comment",
@@ -651,51 +651,6 @@
             },
             "time": "2021-06-18T19:08:09+00:00"
         },
-        {
-            "name": "pocketmine/log-pthreads",
-            "version": "dev-stable",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/pmmp/LogPthreads.git",
-                "reference": "bb3b5395042d12ec0d7ad5c855fd86eaf12869d3"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/pmmp/LogPthreads/zipball/bb3b5395042d12ec0d7ad5c855fd86eaf12869d3",
-                "reference": "bb3b5395042d12ec0d7ad5c855fd86eaf12869d3",
-                "shasum": ""
-            },
-            "require": {
-                "ext-pmmpthread": "^6.0",
-                "php": "^8.1",
-                "pocketmine/log": "^0.4.0"
-            },
-            "conflict": {
-                "pocketmine/spl": "<0.4"
-            },
-            "require-dev": {
-                "phpstan/extension-installer": "^1.0",
-                "phpstan/phpstan": "1.10.3",
-                "phpstan/phpstan-strict-rules": "^1.0"
-            },
-            "default-branch": true,
-            "type": "library",
-            "autoload": {
-                "classmap": [
-                    "./src"
-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "LGPL-3.0"
-            ],
-            "description": "Logging components specialized for pthreads used by PocketMine-MP and related projects",
-            "support": {
-                "issues": "https://github.com/pmmp/LogPthreads/issues",
-                "source": "https://github.com/pmmp/LogPthreads/tree/stable"
-            },
-            "time": "2023-05-19T23:38:36+00:00"
-        },
         {
             "name": "pocketmine/math",
             "version": "0.4.3",
@@ -3298,7 +3253,6 @@
     "minimum-stability": "stable",
     "stability-flags": {
         "pocketmine/classloader": 20,
-        "pocketmine/log-pthreads": 20,
         "pocketmine/snooze": 20
     },
     "prefer-stable": false,