[R] Support integer date and time classes from data.table

### Describe the enhancement requested

The data.table package introduces integer based date and time-of-day classes, `IDate`, and `ITime`. Besides lower storage/memory cost, they offer faster sorting and grouping. It would be useful if Arrow fully supported these classes.

As `IDate` inherits from `Date`, Arrow correctly converts it to `date32` but there is no way to control which R type `date32` is converted to.

``` r
library(arrow)
library(data.table)
```

``` r
id <- as.IDate(Sys.Date())
str(id)
#> IDate[1:1], format: "2024-09-19"
chunked_array(id)
#> ChunkedArray
#>
#> [
#> [
#> 2024-09-19
#> ]
#> ]
str(as.vector(chunked_array(id)))
#> Date[1:1], format: "2024-09-19"
```

`ITime` can be correctly round-tripped, if I’m not mistaken this is because Arrow [preserves metadata](https://arrow.apache.org/docs/r/articles/metadata.html#r-object-attributes).

``` r
it <- as.ITime(Sys.time())
str(it)
#> 'ITime' int 17:27:28
chunked_array(it)
#> ChunkedArray
#>
#> [
#> [
#> 62848
#> ]
#> ]
str(as.vector(chunked_array(it)))
#> 'ITime' int 17:27:28
```

Although this works, converting to `time32` would improve interoperability with other languages. data.table users would need some way to control how `time32` is converted back is this case too.

^{Created on 2024-09-19 with [reprex v2.1.1](https://reprex.tidyverse.org)}

Session info

``` r
sessioninfo::session_info()
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#>
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#> ────────────────────────────────────────────────────────────────────────────────────────────────────
```

### Component(s)

R