Create PackageManifest classes for cocoapods

Creates PackageManifest classes for all individual types of cocoapods manifests
and overrides the methods for detection and PackageManifest creation.

Signed-off-by: Ayan Sinha Mahapatra <ayansmahapatra@gmail.com>

Author: AyanSinhaMahapatra

src/packagedcode/__init__.py

@@ -55,7 +55,9 @@
     phpcomposer.PHPComposerPackage,
     haxe.HaxePackage,
     cargo.RustCargoCrate,
-    cocoapods.CocoapodsPackage,
+    cocoapods.CocoapodsPodspec,
+    cocoapods.CocoapodsPodfileLock,
+    cocoapods.CocoapodsPodspecJSON,
     opam.OpamPackage,
     models.MeteorPackage,
     bower.BowerPackage,