Would it be possible to return empty rows for failing requests?

Hey,

I find myself writing often something like this:
```sql
FROM read_json([
'http://example.com/data.json',
'http://non-existent.test/data.json'
]);
```

or
```
FROM read_json(getvariable('resource_urls'));
```

or
```
FROM read_text(getvariable('resource_urls'));
```

If there are hundreds of URLs every now and then some of the resources will returns errors like these:
```
Could not establish connection error for HTTP HEAD to 'http://non-existent.test/data.json'
Unable to connect to URL "http://example.com/data.json": 404 (Not Found).
```

In this situation all other results will go to waste if 1 url from 300 urls will fail.

There are already excellent configs I can use to increase the retry count and wait times:
```
SET http_retries = 10;
SET http_retry_wait_ms = 2000;
```

Sometimes it's not enough to retry and the resource is not there for a hour or a day or for a week or for a month but will eventually appear again.

Would there be a way to allow missing or failing resource in the larger arrays and still be able to load all other files?

Start by reproducing the failing multi-URL queries using read_json and read_text, including the resource_urls variable form, and review how HTTP errors currently affect the larger input array. Done should mean unavailable resources no longer discard successful results, while the requested empty-row behavior is defined for connection failures and HTTP 404 responses.

Written by the indexing model from the issue text.