Ellie Shin 7d23db3646 Create PackageUnit class, and Package entries to DeclContext / ASTHierarchy ...

Previously enum AccessLimitKind was
added to distinguish access scopes b/t package and public while keeping
DeclContext null but it proved to be too limiting. This PR creates package specific entries for DeclContext and
ASTHierarchy. It create a new class PackageUnit that can be set as the parent DeclContext of ModuleDecl. This PR
contains addition of such entries but not the use of them; the actual use of them will be in the upcoming PRs.

Resolves rdar://106155600

2023-03-02 13:20:51 -08:00

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