add flatbuffers support and initial rewrite

Signed-off-by: Folling <mail@folling.io>

include/ikarus/models/value.fbs

@@ -0,0 +1,85 @@
+namespace Ikarus.Value;
+
+table ToggleDataPoint {
+    data: [bool];
+}
+
+table NumberDataPoint {
+    data: [double];
+}
+
+table TextDataPoint {
+    data: [string];
+}
+
+union Data {
+    ToggleDataPoint,
+    NumberDataPoint,
+    TextDataPoint,
+    SimpleData,
+    CombinedData,
+    ListData,
+    ComplexData
+}
+
+union Schema {
+    ConstantSchema,
+    SimpleSchema,
+    CombinedSchema,
+    ListSchema,
+    ComplexSchema
+}
+
+table ConstantSchema {
+    sub_schema: Schema;
+    data: Data;
+}
+
+table SimpleSchema {
+    sub_schema: Schema;
+}
+
+table SimpleData {
+    data: Data;
+}
+
+table CombinedSchema {
+    schemas: [Schema];
+}
+
+table CombinedData {
+    data: [Data];
+}
+
+table ListSchema {
+    schema: Schema;
+}
+
+table ListData {
+    data: [Data];
+}
+
+table NamedSchema {
+    name: string;
+    schema: Schema;
+}
+
+table ComplexSchema {
+    schemas: [NamedSchema];
+}
+
+table NamedData {
+    name: string;
+    data: Data;
+}
+
+table ComplexData {
+    data: [NamedData];
+}
+
+table Value {
+    schema: Schema;
+    data: Data;
+}
+
+root_type Value;