Move handle store and remaining crsts from BaseDomain to AppDomain

[elinor-fung]

• The handle store was always the global handle store
  • Make all the Create*Handle functions go through the AppDomain
• m_crstLoaderAllocatorReferences is only used for collectible loader allocators - so only assembly loader allocators (which correspond to AppDomain), not the global loader allocator (which corresponds to SystemDomain)
• Remove unnecessary BaseDomain on PinnedHeapHandleTable

cc @jkotas @AaronRobinsonMSFT

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[elinor-fung]

This is the only remaining thing on BaseDomain. Currently, AppDomain and SystemDomain do actually create/use two separate instances. I don't think they need to though?

For SystemDomain it is used via the global loader allocator:

runtime/src/coreclr/vm/loaderallocator.cpp

Line 845 in 9962a19

OBJECTREF* pRef = GetDomain()->AllocateObjRefPtrsInLargeTable(1);

runtime/src/coreclr/vm/loaderallocator.cpp

Line 2385 in 9962a19

GetDomain()->AllocateObjRefPtrsInLargeTable(cSlots, pStaticsInfo, pMTToFillWithStaticBoxes, isClassInitedByUpdatingStaticPointer);

For AppDomain, it appears to just be for EnC:

runtime/src/coreclr/vm/encee.cpp

Line 1489 in 9962a19

*pOR = pDomain->AllocateStaticFieldObjRefPtrs(1);

runtime/src/coreclr/vm/encee.cpp

Line 1497 in 9962a19

*pOR = pDomain->AllocateStaticFieldObjRefPtrs(1);