Rust

scheduler & executor support str and repr #230

Job	Run time
Build Libraries on AMD64 Rust stable	13m 57s
Lint	29s
Test on windows-latest Rust stable	6m 16s
Test on macos-latest Rust stable	3m 3s
verify benchmark results (amd64) (amd64, stable)	10m 45s
Test Workspace on AMD64 Rust stable	8m 14s
Check Cargo.toml formatting (amd64, stable)	1m 28s
Test Ballista on AMD64 Rust stable	5m 26s
Clippy (amd64, stable)	2m 54s
Docker	18s
	52m 50s

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