include rlang::int(1) and similar in literal_coercion_linter

`rlang::int()` is really meant to be a typed builder like `c(1, 2, 3)` with specified output type like

```
rlang::int(1, 3, 5) == c(1L, 3L, 5L)
rlang::chr("a", "b", "c") = c("a", "b", "c")
```

but if `...lengths() == 1`, it seems reasonable to just use a literal instead.