Update the libraries to reflect Send loosing the 'static bound.

Update the libraries to reflect Send loosing the 'static bound.

In most places this preserves the current API by adding an explicit
`'static` bound.

Notably absent are some impls like `unsafe impl<T: Send> Send for
Foo<T>` and the `std::thread` module. It is likely that it will be
possible to remove these after auditing the code to ensure restricted
lifetimes are safe.

More progress on #22251.