Rust

Add attestation key registration service #345

Job	Run time
Tests, unstable toolchain (nightly)	4m 39s
Tests (release), stable toolchain	6m 24s
Tests, unstable toolchain (beta)	4m 26s
Tests, stable toolchain	4m 38s
Tests (release), minimum supported toolchain	8m 55s
	29m 2s

Provide feedback