Added go text template writier (#1)

feat(templ): ✨ added templ to command line that reads go template and outputs code

Reviewed-on: #1
Co-authored-by: Hein <hein.puth@gmail.com>
Co-committed-by: Hein <hein.puth@gmail.com>

pkg/commontypes/rust.go

@@ -0,0 +1,72 @@
+package commontypes
+
+// RustTypeMap maps PostgreSQL types to Rust types
+var RustTypeMap = map[string]string{
+	// Integer types
+	"integer":     "i32",
+	"int":         "i32",
+	"int4":        "i32",
+	"smallint":    "i16",
+	"int2":        "i16",
+	"bigint":      "i64",
+	"int8":        "i64",
+	"serial":      "i32",
+	"bigserial":   "i64",
+	"smallserial": "i16",
+
+	// String types
+	"text":      "String",
+	"varchar":   "String",
+	"char":      "String",
+	"character": "String",
+	"citext":    "String",
+	"bpchar":    "String",
+	"uuid":      "String",
+
+	// Boolean
+	"boolean": "bool",
+	"bool":    "bool",
+
+	// Float types
+	"real":             "f32",
+	"float4":           "f32",
+	"double precision": "f64",
+	"float8":           "f64",
+	"numeric":          "f64",
+	"decimal":          "f64",
+
+	// Date/Time types (using chrono crate)
+	"timestamp":                   "NaiveDateTime",
+	"timestamp without time zone": "NaiveDateTime",
+	"timestamp with time zone":    "DateTime<Utc>",
+	"timestamptz":                 "DateTime<Utc>",
+	"date":                        "NaiveDate",
+	"time":                        "NaiveTime",
+	"time without time zone":      "NaiveTime",
+	"time with time zone":         "DateTime<Utc>",
+	"timetz":                      "DateTime<Utc>",
+
+	// Binary
+	"bytea": "Vec<u8>",
+
+	// JSON
+	"json":  "serde_json::Value",
+	"jsonb": "serde_json::Value",
+}
+
+// SQLToRust converts SQL types to Rust types
+func SQLToRust(sqlType string, nullable bool) string {
+	baseType := ExtractBaseType(sqlType)
+
+	rustType, ok := RustTypeMap[baseType]
+	if !ok {
+		rustType = "String"
+	}
+
+	// Handle nullable types with Option<T>
+	if nullable {
+		return rustType
+	}
+
+	return "Option<" + rustType + ">"
+}