Minimize PR 22 (#26)

* specific functions added to eval different rego components

Signed-off-by: eric-therond <eric.therond.fr@gmail.com>

* allow multiple inputs and results

Signed-off-by: eric-therond <eric.therond.fr@gmail.com>

* prepare_for_eval is necessary to be called

Signed-off-by: eric-therond <eric.therond.fr@gmail.com>

* test with the suggested code examples and clean scopes

Signed-off-by: eric-therond <eric.therond.fr@gmail.com>

* try to refactor first steps of evaluations

Signed-off-by: eric-therond <eric.therond.fr@gmail.com>

* improve coverage and fix clean state internal evaluation

Signed-off-by: eric-therond <eric.therond.fr@gmail.com>

* add getters and setters and fix clean function

Signed-off-by: eric-therond <eric.therond.fr@gmail.com>

* Tests are single input by default. Multi input specified via "many!" marker.

Signed-off-by: Anand Krishnamoorthi <anakrish@microsoft.com>

---------

Signed-off-by: eric-therond <eric.therond.fr@gmail.com>
Signed-off-by: Anand Krishnamoorthi <anakrish@microsoft.com>
Co-authored-by: eric-therond <eric.therond.fr@gmail.com>

tests/interpreter/cases/input/multiple.yaml

@@ -0,0 +1,33 @@
+# Copyright (c) Microsoft Corporation.
+# Licensed under the MIT License.
+
+cases:
+  - note: input-multiple-1
+    data: {}
+    input:
+      many!: 
+        - { x: 1 }
+        - { x: 5 }
+    modules:
+      - |
+        package test
+        
+        x[a] {
+          a = y
+        }
+
+        y[a] {
+          a = input.x + 5
+        }
+
+    query: data.test
+    want_result:
+      many!:
+        - y: 
+            set!: [6]
+          x: 
+            set!: [ set!: [6] ]
+        - y: 
+            set!: [10]
+          x: 
+            set!: [ set!: [10] ]