feat(connector): add VDM data type for Aircraft

connector/shared/src/commonMain/kotlin/io/anthonyberg/connector/shared/vdmj/type/Aircraft.kt

@@ -0,0 +1,69 @@
+package io.anthonyberg.connector.shared.vdmj.type
+
+/**
+ * Aircraft record type in the VDM-SL model
+ */
+data class Aircraft(
+    val items: Map<String, String>, // TODO value should be ItemObject type
+    val procedure: MutableList<String> // TODO change String to a ProcedureItem type
+) {
+    /**
+     * Converts variables in object to a String that can be passed into VDM
+     *
+     * @return VDM record String
+     */
+    fun toVDMString(): String {
+        var output = "mk_Aircraft("
+        output += itemsToVDMString()
+        output += ","
+        output += procedureToVDMString()
+        output += ")"
+
+        return output
+    }
+
+    /**
+     * Creates a String VDM map for items
+     *
+     * @return String VDM representation of a map
+     */
+    private fun itemsToVDMString(): String {
+        var output = "{"
+
+        for (dref: String in items.keys) {
+            val value = items.getValue(dref)
+
+            // TODO make sure to run toString on value once items Map changes the value type
+            output += "\"$dref\" |-> $value,"
+        }
+
+        // Removes the last comma in the VDM map as it will error otherwise
+        output.dropLast(1)
+
+        output += "}"
+
+        return output
+    }
+
+    /**
+     * Creates a String VDM sequence for the procedure
+     *
+     * @return String VDM representation of a sequence
+     */
+    private fun procedureToVDMString(): String {
+        var output = "["
+
+        // TODO change item type to Procedure type
+        for (item: String in procedure) {
+            output += item
+            output += ","
+        }
+
+        // Removes the last comma in the VDM sequence as it will error otherwise
+        output.dropLast(1)
+
+        output += "]"
+
+        return output
+    }
+}