AK: Convert AK::Format formatting helpers to returning ErrorOr<void>

This isn't a complete conversion to ErrorOr<void>, but a good chunk.
The end goal here is to propagate buffer allocation failures to the
caller, and allow the use of TRY() with formatting functions.

Kernel/KBufferBuilder.h

@@ -37,7 +37,7 @@ public:
         // FIXME: This really not ideal, but vformat expects StringBuilder.
         StringBuilder builder;
         AK::VariadicFormatParams variadic_format_params { parameters... };
-        vformat(builder, fmtstr.view(), variadic_format_params);
+        TRY(vformat(builder, fmtstr.view(), variadic_format_params));
         return append_bytes(builder.string_view().bytes());
     }