Correlations: Add CreateCorrelation HTTP API (#51630)

* Correlations: add migration

* Correlations: Add CreateCorrelation API

* Correlations: Make correlations work with provisioning

* Handle version changes

* Fix lining error

* lint fixes

* rebuild betterer results

* add a UID to each correlation

* Fix lint errors

* add docs

* better wording in API docs

* remove leftover comment

* handle ds updates

* Fix error message typo

* add bad data test

* make correlations a separate table

* skip readonly check when provisioning correlations

* delete stale correlations when datasources are deleted

* restore provisioned readonly ds

* publish deletion event with full data

* generate swagger and HTTP API docs

* apply source datasource permission to create correlation API

* Fix tests & lint errors

* ignore empty deletion events

* fix last lint errors

* fix more lint error

* Only publish deletion event if datasource was actually deleted

* delete DS provisioning deletes correlations, added & fixed tests

* Fix unmarshalling tests

* Fix linting errors

* Fix deltion event tests

* fix small linting error

* fix lint errors

* update betterer

* fix test

* make path singular

* Revert "make path singular"

This reverts commit 420c3d315e.

* add integration tests

* remove unneeded id from correlations table

* update spec

* update leftover references to CorrelationDTO

* fix tests

* cleanup tests

* fix lint error

pkg/services/provisioning/values/values.go

@@ -188,6 +188,47 @@ func (val *StringMapValue) Value() map[string]string {
 	return val.value
 }
 
+// JSONSliceValue represents a slice value in a YAML
+// config that can be overridden by environment variables
+
+type JSONSliceValue struct {
+	value []map[string]interface{}
+	Raw   []map[string]interface{}
+}
+
+// UnmarshalYAML converts YAML into an *JSONSliceValue
+func (val *JSONSliceValue) UnmarshalYAML(unmarshal func(interface{}) error) error {
+	unmarshaled := make([]interface{}, 0)
+	err := unmarshal(&unmarshaled)
+	if err != nil {
+		return err
+	}
+	interpolated := make([]map[string]interface{}, 0)
+	raw := make([]map[string]interface{}, 0)
+
+	for _, v := range unmarshaled {
+		i := make(map[string]interface{})
+		r := make(map[string]interface{})
+		for key, val := range v.(map[interface{}]interface{}) {
+			i[key.(string)], r[key.(string)], err = transformInterface(val)
+			if err != nil {
+				return err
+			}
+		}
+		interpolated = append(interpolated, i)
+		raw = append(raw, r)
+	}
+
+	val.Raw = raw
+	val.value = interpolated
+	return err
+}
+
+// Value returns the wrapped []interface{} value
+func (val *JSONSliceValue) Value() []map[string]interface{} {
+	return val.value
+}
+
 // transformInterface tries to transform any interface type into proper value with env expansion. It traverses maps and
 // slices and the actual interpolation is done on all simple string values in the structure. It returns a copy of any
 // map or slice value instead of modifying them in place and also return value without interpolation but with converted