[SharedCache] Make `m_exportInfos` map's values a `shared_ptr`

This avoids expensive copying when returning a value from the map in `SharedCache::GetExportListForHeader`. Additionally it ensures that the value stays alive and at the same location in memory if `m_exportInfos` is modified and requires its storage to be re-allocated.

I was unable to use a `unique_ptr` instead of a `shared_ptr` because of copy semantics with `m_exportInfos` in `ViewStateCacheStore`. I don't see things being any worse using `shared_ptr` instead of `unique_ptr` anyway and it means less code changes.

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