Everywhere: Split Error::from_string_literal and Error::from_string_view

Error::from_string_literal now takes direct char const*s, while
Error::from_string_view does what Error::from_string_literal used to do:
taking StringViews. This change will remove the need to insert `sv`
after error strings when returning string literal errors once
StringView(char const*) is removed.

No functional changes.

Userland/Libraries/LibCore/Stream.cpp

@@ -336,7 +336,8 @@ ErrorOr<IPv4Address> Socket::resolve_host(String const& host, SocketType type)
             return Error::from_syscall("getaddrinfo", -errno);
         }
 
-        return Error::from_string_literal(gai_strerror(rc));
+        auto const* error_string = gai_strerror(rc);
+        return Error::from_string_view({ error_string, strlen(error_string) });
     }
 
     auto* socket_address = bit_cast<struct sockaddr_in*>(results->ai_addr);