Rust

Implement `RustCodeGenerator::add_local_attr` #418

Job	Run time
Clippy	22s
Check	17s
Test Coverage	1s
Check license and vulnerabilities	14s
ETSI	29s
Rustfmt	4s
Test Suite (all)	38s
Test build binary	19s
Test Suite (default)	34s
Test Suite (protobuf)	38s
	3m 36s

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