Implement Integral Data Types (#13)

**Rationale:**

Integral Types were missing and are needed for Project Nautilus.

**Changes:**

- Implements Integral Data Types
  - u64 and i64 implemented through bigint

Reviewed-on: #13
Co-authored-by: Sergey Savelyev <sergeysav.nn@gmail.com>
Co-committed-by: Sergey Savelyev <sergeysav.nn@gmail.com>

server/src/telemetry/management_service.rs

@@ -3,8 +3,6 @@ use crate::telemetry::data_item::TelemetryDataItem;
 use crate::telemetry::definition::TelemetryDefinition;
 use crate::telemetry::history::{TelemetryHistory, TelemetryHistoryService};
 use anyhow::bail;
-use api::data_type::DataType;
-use api::data_value::DataValue;
 use api::messages::telemetry_definition::{
     TelemetryDefinitionRequest, TelemetryDefinitionResponse,
 };
@@ -144,11 +142,7 @@ impl TelemetryManagementService {
             bail!("Telemetry Item Not Found");
         };
 
-        let expected_type = match &tlm_item.value {
-            DataValue::Float32(_) => DataType::Float32,
-            DataValue::Float64(_) => DataType::Float64,
-            DataValue::Boolean(_) => DataType::Boolean,
-        };
+        let expected_type = tlm_item.value.to_data_type();
         if expected_type != tlm_data.data.definition.data_type {
             bail!("Data Type Mismatch");
         };