clean, feat: `DebugInfo` and `LogEntry` need `Printf` style APIs & option to expand or not linear expressions

Functionally these are similar. Nice features to have may be something like;

```go
d := ....Printf("foo bar %lx + %l == %lx")
// %lx would expand a linear expression as (2+3+7) in the trace
// %l would just evaluate the linear expression as 12
```