This PR exposes a config option that allows the disabling of the
automatic trimming behavior. The motivation behind this option is to
support things like:

```
Version = 2
Stable  = false
Diff    =
+/- Job: "example"
+/- Task Group: "cache"
  +/- RestartPolicy {
    +/- Attempts: "9" => "10"
        Delay:    "25000000000"
        Interval: "300000000000"
        Mode:     "delay"
      }
      Task: "redis"

Version = 1
Stable  = false
Diff    =
+/- Job: "example"
+/- Task Group: "cache"
  +/- RestartPolicy {
    +/- Attempts: "8" => "9"
        Delay:    "25000000000"
        Interval: "300000000000"
        Mode:     "delay"
      }
      Task: "redis"
```

Without the option the output would be:
```
Version = 2
Stable  = false
Diff    = +/- Job: "example"
+/- Task Group: "cache"
  +/- RestartPolicy {
    +/- Attempts: "9" => "10"
        Delay:    "25000000000"
        Interval: "300000000000"
        Mode:     "delay"
      }
      Task: "redis"

Version = 1
Stable  = false
Diff    = +/- Job: "example"
+/- Task Group: "cache"
  +/- RestartPolicy {
    +/- Attempts: "8" => "9"
        Delay:    "25000000000"
        Interval: "300000000000"
        Mode:     "delay"
      }
      Task: "redis"
```

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