enhancement: Keyword Query Language (KQL) search syntax support (#7043)

* feat(search): introduce search query package

With the increasing complexity of how we organize our resources, the search must also be able to find them using entity properties.

The query package provides the necessary functionality to do this.

This makes it possible to search for resources via KQL, the microsoft spec is largely covered and can be used for this.

In the current state, the legacy query language is still used, in a future update this will be deprecated and KQL will become the standard

services/search/pkg/query/kql/dictionary.peg

@@ -0,0 +1,108 @@
+{
+    package kql
+}
+
+////////////////////////////////////////////////////////
+// ast
+////////////////////////////////////////////////////////
+
+AST <-
+    _ nodes:Nodes _ {
+        return buildAST(nodes, c.text, c.pos)
+    }
+
+Nodes <-
+    n:(
+        _
+        (
+            GroupNode /
+            PropertyRestrictionNodes /
+            BooleanOperatorNode /
+            FreeTextKeywordNodes
+        )
+        _
+    )+ {
+      return buildNodes(n)
+    }
+
+////////////////////////////////////////////////////////
+// nesting
+////////////////////////////////////////////////////////
+
+GroupNode <-
+    k:(Char+)? (ColonOperator / EqualOperator)? "(" v:Nodes ")" {
+        return buildGroupNode(k, v, c.text, c.pos)
+    }
+
+////////////////////////////////////////////////////////
+// property restrictions
+////////////////////////////////////////////////////////
+
+PropertyRestrictionNodes <-
+    YesNoPropertyRestrictionNode /
+    TextPropertyRestrictionNode
+
+YesNoPropertyRestrictionNode <-
+    k:Char+ (ColonOperator / EqualOperator) v:("true" / "false"){
+        return buildBooleanNode(k, v, c.text, c.pos)
+    }
+
+TextPropertyRestrictionNode <-
+    k:Char+ (ColonOperator / EqualOperator) v:(String / [^ ()]+){
+        return buildStringNode(k, v, c.text, c.pos)
+    }
+
+
+////////////////////////////////////////////////////////
+// free text-keywords
+////////////////////////////////////////////////////////
+
+FreeTextKeywordNodes <-
+    PhraseNode /
+    WordNode
+
+PhraseNode <-
+     ColonOperator? _ v:String _ ColonOperator? {
+        return buildStringNode("", v, c.text, c.pos)
+    }
+
+WordNode <-
+     ColonOperator? _ v:[^ :()]+ _ ColonOperator? {
+        return buildStringNode("", v, c.text, c.pos)
+    }
+
+////////////////////////////////////////////////////////
+// operators
+////////////////////////////////////////////////////////
+
+BooleanOperatorNode <-
+    ("AND" / "OR" / "NOT") {
+        return buildOperatorNode(c.text, c.pos)
+    }
+
+ColonOperator <-
+    ":" {
+        return c.text, nil
+    }
+
+EqualOperator <-
+    "=" {
+        return c.text, nil
+    }
+
+////////////////////////////////////////////////////////
+// misc
+////////////////////////////////////////////////////////
+
+Char <-
+    [A-Za-z] {
+        return c.text, nil
+    }
+
+String <-
+    '"' v:[^"]* '"' {
+        return v, nil
+    }
+
+_ <-
+    [ \t]*