Feature request: expect_snapshot_value should allow waldo::compare options

**Current behaviour**
```
expect_snapshot_value(mean(rnorm(10000)), 0)
## Error: snapshot values do not match
```

**Expected behaviour**
```
expect_snapshot_value(mean(rnorm(10000)), 0, tolerance=0.01)
```

Expect_snapshot_value is missing options to pass to waldo::compare.