Add host additional info filters (#28)
This change adds the ability to filter additional host info via the list hosts endpoint; a continuation from [here](https://github.com/kolide/fleet/pull/2330), but now filtering is accomplished via SQL.
Additional object without filter:
```
curl 'https://localhost:8080/api/v1/kolide/hosts'
...
"additional": {
"macs": [
{
"mac": "00:00:00:00:00:00"
},
{
"mac": "02:42:c0:a8:10:05"
}
],
"time": [
{
"day": "13",
"hour": "3",
"year": "2020",
"month": "10",
"minutes": "43",
"seconds": "11",
"weekday": "Tuesday",
"datetime": "2020-10-13T03:43:11Z",
"iso_8601": "2020-10-13T03:43:11Z",
"timezone": "GMT",
"timestamp": "Tue Oct 13 03:43:11 2020 UTC",
"unix_time": "1602560591",
"local_time": "1602560591",
"local_timezone": "UTC"
}
},
...
```
Additional object with filter:
```
curl 'https://localhost:8080/api/v1/kolide/hosts?additional_info_filters=macs,notreal'
...
"additional": {
"macs": [
{
"mac": "00:00:00:00:00:00"
},
{
"mac": "02:42:c0:a8:10:05"
}
],
"notreal": null
},
...
```
billcobbler
618ba56484