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

config/pkg/tool/zig.yml

@@ -0,0 +1,14 @@
+zig:
+  type: tool
+  artifact:
+    binary: custom
+  tool:
+    provides:
+      - zig
+      - zig-cc
+      - zig-c++
+      - zig-ar
+      - zig-ld.lld
+      - zig-ranlib
+      - zig-objcopy
+    binary-subdir: zig