feat: variable references (#1654)

* feat: add references to the base code instead of the maps experiment

* feat: add template functions to ref resolver

* feat: tests

* docs: variable references

* feat: remove json and yaml keys from map variable experiment

* chore: typo

testdata/vars/any2/Taskfile.yml

@@ -10,7 +10,6 @@ tasks:
     - task: ref-dep
     - task: ref-resolver
     - task: json
-    - task: yaml
 
   map:
     vars:
@@ -93,25 +92,13 @@ tasks:
       JSON_STRING:
         sh: cat example.json
       JSON:
-        json: "{{.JSON_STRING}}"
+        ref: "fromJson .JSON_STRING"
     cmds:
       - task: print-story
         vars:
           VAR:
             ref: .JSON
 
-  yaml:
-    vars:
-      YAML_STRING:
-        sh: cat example.yaml
-      YAML:
-        yaml: "{{.YAML_STRING}}"
-    cmds:
-      - task: print-story
-        vars:
-          VAR:
-            ref: .YAML
-
   print-var:
     cmds:
       - echo "{{.VAR}}"