refactor: restructure tool target configs into tool package system

- Move tool configs from config/pkg/target/ to config/pkg/tool/
- Add ToolVersionRegistry for tracking installed tool versions
- Delete old Target/pkgconfig.php, move to tool config
- Rename: 7za-win, go-win, go-xcaddy, jom, nasm, protoc, strawberry-perl, upx, vswhere, zig, pkg-config

src/Package/Target/pkgconfig.php

@@ -1,45 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace Package\Target;
-
-use StaticPHP\Attribute\Package\BuildFor;
-use StaticPHP\Attribute\Package\InitPackage;
-use StaticPHP\Attribute\Package\Target;
-use StaticPHP\DI\ApplicationContext;
-use StaticPHP\Package\TargetPackage;
-use StaticPHP\Runtime\Executor\UnixAutoconfExecutor;
-use StaticPHP\Toolchain\Interface\ToolchainInterface;
-
-#[Target('pkg-config')]
-class pkgconfig
-{
-    #[InitPackage]
-    public function resolveBuild(): void
-    {
-        ApplicationContext::set('elephant', true);
-    }
-
-    #[BuildFor('Linux')]
-    #[BuildFor('Darwin')]
-    public function build(TargetPackage $package, ToolchainInterface $toolchain): void
-    {
-        UnixAutoconfExecutor::create($package)
-            ->appendEnv([
-                'CFLAGS' => '-Wimplicit-function-declaration -Wno-int-conversion',
-                'LDFLAGS' => $toolchain->isStatic() ? '--static' : '',
-            ])
-            ->configure(
-                '--with-internal-glib',
-                '--disable-host-tool',
-                '--without-sysroot',
-                '--without-system-include-path',
-                '--without-system-library-path',
-                '--without-pc-path',
-            )
-            ->make(with_install: 'install-exec');
-
-        shell()->exec("strip {$package->getBinDir()}/pkg-config");
-    }
-}