DataLinks: enable access to labels & field names (#18918)

* POC: trying to see if there is a way to support objects in template interpolations

* Added support for nested objects, and arrays

* Added accessor cache

* fixed unit tests

* First take

* Use links supplier in graph

* Add field's index to cache items

* Get field index from field cache

* CHange FiledCacheItem to FieldWithIndex

* Add refId to TimeSeries class

* Make field link supplier work with _series, _field and _value vars

* use field link supplier in graph

* Fix yaxis settings

* Update dashboard schema version and add migration for data links variables

* Update snapshots

* Update build in data link variables

* FieldCache - idx -> index

* Add current query results to panel editor

* WIP Updated data links dropdown to display new variables

* Fix build

* Update variables syntac in field display, update migration

* Field links supplier: review updates

* Add data frame view and field name to TimeSeries for later inspection

* Retrieve data frame from TimeSeries when clicking on plot graph

* Use data frame's index instead of view

* Retrieve data frame by index instead of view on TimeSeries

* Update data links prism regex

* Fix typecheck

* Add value variables to suggestions list

* UI update

* Rename field to config in DisplayProcessorOptions

* Proces single value of a field instead of entire data frame

* Updated font size from 10px to 12px for auto complete

* Replace fieldName with fieldIndex in TimeSeries

* Don't use .entries() for iterating in field cache

* Don't use FieldCache when retrieving field for datalinks in graph

* Add value calculation variable to data links (#19031)

* Add support for labels with dots in the name (#19033)

* Docs update

* Use field name instead of removed series.fieldName

* Add test dashboard

* Typos fix

* Make visualization tab subscribe to query results

* Added tags to dashboard so it shows up in lists

* minor docs fix

* Update singlestat-ish variables suggestions to contain series variables

* Decrease suggestions update debounce

* Enable whitespace characters(new line, space) in links and strip them when processing the data link

* minor data links UI update

* DataLinks: Add __from and __to variables suggestions to data links (#19093)

* Add from and to variables suggestions to data links

* Update docs

* UI update and added info text

* Change ESC global bind to bind (doesn't capture ESC on input)

* Close datalinks suggestions on ESC

* Remove unnecessary fragment

public/app/core/logs_model.ts

@@ -246,7 +246,7 @@ export function logSeriesToLogsModel(logSeries: DataFrame[]): LogsModel {
       hasUniqueLabels = true;
     }
 
-    const timeFieldIndex = fieldCache.getFirstFieldOfType(FieldType.time);
+    const timeField = fieldCache.getFirstFieldOfType(FieldType.time);
     const stringField = fieldCache.getFirstFieldOfType(FieldType.string);
     const logLevelField = fieldCache.getFieldByName('level');
 
@@ -256,7 +256,7 @@ export function logSeriesToLogsModel(logSeries: DataFrame[]): LogsModel {
     }
 
     for (let j = 0; j < series.length; j++) {
-      const ts = timeFieldIndex.values.get(j);
+      const ts = timeField.values.get(j);
       const time = dateTime(ts);
       const timeEpochMs = time.valueOf();
       const timeFromNow = time.fromNow();