BaseBundle.java: Recycle underlying parcel when bundle is cleared.

Lazy Bundles, (aosp/1787847), introduced a change in behavior where a Parcel
created as part of initializing a Bundle is dependent on the next ART GC run to be
recycled, causing a short term memory-leak.

To land this in T, we are making the change targetted and allowing
consumers to opt into the parcel being immediately cleared by calling
.clear() on the bundle.

As part of the unparcel() in clear(), mParcelledData is set to null, and
mMap may or may not still contain references through lazy values,
depending on if the lazy valyes have been unmarshalled.  As
such, we keep a weak reference to mParcelledData we can use to recycle it.

The mParcelledData reference could have been copied to other bundles in
a few operations:
new Bundle(Bundle o)
bundle.deepCopy()
bundle.putAll()

In this case we can not recycle the parcel yet as other bundles may
still require it. If so, we will skip the recycle and rely on the later GC pass

Bug: 233216232
Test: Reproduced linked bug on-device
Test: atest android.os.cts.ParcelTest android.os.cts.BundleTest android.os.BundleTest android.os.ParcelTest
Change-Id: Ic26eceaa1c11da67866af0963f760423d41d54bc

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