RFR: 8374549: Extend MetaspaceClosure to cover non-MetaspaceObj types

[Ioi Lam]

Previously, `MetaspaceClosure` could iterate only `MetaspaceObject`, using its four member functions:

- `is_read_only_by_default()`
- `metaspace_pointers_do()`
- `size()`
- `type()`

`PackageEntry`, `ModuleEntry` and `GrowableArray` cannot be subclasses from `MetaspaceObject` due to various constraints.  As a result, they were copied with ad-hoc code.

This PR updates the templates in `MetaspaceClosure` so that it can iterate any classes  that have the above four functions. This allows new types of data to be uniformly copied into the AOT cache (aka CDS archive) without ad-hoc copiers.

This PR is necessary for future evolution of AOT as more types of data will be copied into the AOT cache. For example, in Valhalla we have a `GrowableArray` that needs to be copied along with `AdapterHandleEntry`.

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Commit messages:
 - More clean up -- MetaspaceObj::Type -> MetaspaceClosureType
 - clean up
 - Remove test code inside HotSpot for OtherCArrayRef and MSOCArrayRef
 - Added OtherCArrayRef and MSOCArrayRef
 - Removed old code that explicitly convert between GrowableArray and Array
 - Finished copying and clean up of PackageEntry, ModuleEntry and their growable arrays. These are not actually used by the production run yet
 - clean up
 - rename size() to size_in_heapwords() for types that are not MetaspaceObj
 - Add MetaspaceClosure support functions back to AOTGrowableArray
 - New AOTGrowableArray<T> class
 - ... and 7 more: https://git.openjdk.org/jdk/compare/6b3c1e0f...331fe165

Changes: https://git.openjdk.org/jdk/pull/29049/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=29049&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8374549
  Stats: 1166 lines in 30 files changed: 651 ins; 306 del; 209 mod
  Patch: https://git.openjdk.org/jdk/pull/29049.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29049/head:pull/29049

PR: https://git.openjdk.org/jdk/pull/29049