[Performance] Refactor TTFMP query from, to fields (#213911)

Currently Kibana forwards `query_range_secs` and `query_offset_secs` to
mark the selected time range when reporting TTFMP event. This format
caused some challenges to identify `from`, `to` date offsets in
visualizations.

To simplify, the PR renames and sends the three fields explicitly:
- `query_from_offset_secs` offset to `0` (now), with -ve for past and
+ve for future dates
- `query_to_offset_secs` offset to `0` (now), with -ve for past and +ve
for future dates
- `query_range_secs`                      same as previously sent

_This approach is followed after a discussion, and based on the
[gist](https://gist.github.com/andrewvc/1f04a57a336d768e4ec5ff2eff06ba54)
excerpt:_

```
Earliest date -> QueryFrom
Newest date -> QueryTo
Duration -> QueryRange
```

### Indexing
These fields then should be mapped in the EBT indexer to ingest in the
top level of the document, eventually removing the need to create
runtime fields in data views for visualizations.

Also, runtime fields in data views should be updated to reflect this
change. For backward compatibility, the runtime fields can cater both
the old and new field names conditionally.

### Testing
- Ensure that the TTFMP events are correctly reporting the date ranges.

### Example

![image](https://github.com/user-attachments/assets/529507fc-66f7-440a-8bbb-b34176e8d093)

dev_docs/tutorials/performance/adding_custom_performance_metrics.mdx

@@ -330,8 +330,9 @@ This will be indexed as:
     "duration": 736,                                                    // Event duration as specified when reporting it
     "meta": {
       "target": '/home',
-      "query_range_secs": 900
-      "query_offset_secs": 0 // now
+      "query_range_secs": 900, // 15 minutes
+      "query_from_offset_secs": -900 // From 15 minutes ago
+      "query_to_offset_secs": 0 // To now
     },
     "context": {                                                        // Context holds information identifying the deployment, version, application and page that generated the event
       "version": "8.16.0-SNAPSHOT",