Rename ResourcePathShortener to Obfuscator

ResourcePathShortener is a part of Obfuscator. Obfuscator will not
only shorten the path but also handle obfuscating resource names.

Format C++ code by clang-format.

Bug: 228192695

Test: atest aapt2_test idmap2_test
Change-Id: I27b4b1af44061e3cd8a6717ffd46b8a187cdc41d
diff --git a/tools/aapt2/Android.bp b/tools/aapt2/Android.bp
index a4199b6..7ddbe95 100644
--- a/tools/aapt2/Android.bp
+++ b/tools/aapt2/Android.bp
@@ -130,7 +130,7 @@
         "optimize/MultiApkGenerator.cpp",
         "optimize/ResourceDeduper.cpp",
         "optimize/ResourceFilter.cpp",
-        "optimize/ResourcePathShortener.cpp",
+        "optimize/Obfuscator.cpp",
         "optimize/VersionCollapser.cpp",
         "process/SymbolTable.cpp",
         "split/TableSplitter.cpp",