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/Cargo.toml

@@ -15,6 +15,7 @@ derive_more = { workspace = true, features = ["from"] }
 fern = { workspace = true, features = ["colored"] }
 futures-util = { workspace = true }
 log = { workspace = true }
+num-traits = { workspace = true }
 papaya = { workspace = true }
 serde = { workspace = true, features = ["derive"] }
 serde_json = { workspace = true }