Everywhere: Slap some [[clang::lifetimebound]] where appropriate

This first pass only applies to the following two cases:
- Public functions returning a view type into an object they own
- Public ctors storing a view type

This catches a grand total of one (1) issue, which is fixed in
the previous commit.

Libraries/LibLine/Editor.h

@@ -249,7 +249,7 @@ public:
 
     bool is_editing() const { return m_is_editing; }
 
-    Utf32View const buffer_view() const { return { m_buffer.data(), m_buffer.size() }; }
+    Utf32View const buffer_view() const LIFETIME_BOUND { return { m_buffer.data(), m_buffer.size() }; }
 
     auto prohibit_input()
     {