Request Metrics.go convertField to add addional array types

Nobody has claimed this yet.

### Use Case

I have an OPC UA server that provides array data as `[]int32` `[]float64` and `[]string`.

For me I changed/added metric.go (function convertField) as following:

```
+ case []int32:
+ return []int32(v)
+ case []string:
+ return []string(v)
+ case []float64:
+ return []float64(v)
case *int16:
if v != nil {
return int64(*v)
```

This works for output.File with type JSON.
I do not know the side effects, but may be it helps others... or someone could check it for side effects...

[metrics_int32_float32_string_array.patch](https://github.com/influxdata/telegraf/files/11162277/metrics_int32_float32_string_array.patch)

### Expected behavior

I want to output also array-type OPC UA data to (JSON) files. (only one I tested, may be works also with other plugins)

### Actual behavior

Without the mentioned patch it does not store the array values to the file.
The function `convertField` returns nil for `[]int32` `[]float64` and `[]string` so that the field is not written to output.

### Additional info

_No response_

Start in metric.go at convertField and inspect how output.File serializes fields as JSON. Compare the handling of []int32, []float64, and []string with the provided patch, then verify that array values are retained in JSON output without changing existing conversions.

Written by the indexing model from the issue text.