Rust

feat: Add option to limit number of executor worker threads #205

Job	Run time
Build Libraries on AMD64 Rust stable	14m 6s
Lint	20s
Test on windows-latest Rust stable	7m 12s
Test on macos-latest Rust stable	3m 57s
verify benchmark results (amd64) (amd64, stable)	10m 50s
Test Workspace on AMD64 Rust stable	8m 3s
Test Ballista on AMD64 Rust stable	5m 25s
Check Cargo.toml formatting (amd64, stable)	1m 43s
Clippy (amd64, stable)	3m 4s
Docker	14s
	54m 54s

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