Add StaticStringView Utility

We frequently pass and store strings that are generated/known at
compile-time. Since these strings are constant, we can place them in
static storage, and be guaranteed that their lifetime is valid
throughout the duration of the program. This allows us to pass
non-owning references (such as string_view) without any concern for
lifetime validity.

The StaticStringView is a string_view whose referant is a static,
constant string.  Additionally, we can concatenate and
convert from string literals at compile time for typical log-string
generation.

Test: atest StaticStringTests
Bug: 238654698
Change-Id: I067bd4330dcc39dc0bde269fb67306484c275faa