[LifetimeSafety] Umbrella issue for all milestones for temporal safety

[usx95]

Tracking issue for implementation of lifetime safety. See RFC for details. Tasks are filed as sub-issues of this issue.

Getting involved

Contributions are more than welcome. Please reach out to usx@google.com if you would like to get involved.

Progress status

Milestone 1:

• Basic return-stack-addr with C++ raw pointers. DONE
• Basic use-after-scope with C++ raw pointers. Open to contribution

Milestone 2

• Support View-Types (DONE)
• Support Lifetimebound (DONE)

[usx95]

cc @llvm/issue-subscribers-clang-temporal-safety