feat(query): Implement query endpoint

ilp-cw-api/[POST] query/three eqs.bru

@@ -0,0 +1,53 @@
+meta {
+  name: three eqs
+  type: http
+  seq: 1
+}
+
+post {
+  url: {{API_BASE}}/query
+  body: json
+  auth: inherit
+}
+
+body:json {
+  [
+    {
+      "attribute": "capacity",
+      "operator": "=",
+      "value": "20"
+    },
+    {
+      "attribute": "heating",
+      "operator": "=",
+      "value": "false"
+    },  
+    {
+      "attribute": "cooling",
+      "operator": "=",
+      "value": "true"
+    }
+  ]
+}
+
+assert {
+  res.status: eq 200
+  res.body: length 1
+}
+
+tests {
+  test("Response body is a JSON array", function() {
+    expect(res.getBody()).to.be.an('array');
+  });
+  
+  test("Array is not empty and contains Strings", function() {
+    const data = res.getBody();
+    expect(data[0]).to.be.a('string'); // data should be in string 
+  });
+  
+}
+
+settings {
+  encodeUrl: true
+  timeout: 0
+}