* ci: Upgrade rust-cache to v2.2.0
v2.0.0 uses API that is deprecated
* ci: Use --workspace in cargo llvm-cov
* ci: Replace actions-rs/toolchain by dtolnay/rust-toolchain
actions-rs/toolchain is under inactive maintenance, it uses node12 that
would soon becomes deprecated
* ci: Replace actions-rs/cargo by run
* ci: rust-cache and cleanup-disk-action try not to specific full version
* ci: Use nextest
Also sets timeout for nextest to avoid a test hanging too long
* ci: Upgrade actions/checkout to v3
To upgrade node from 12 to 16
* ci: Specific cleanup-disk-action version
* ci: use lld linker for ci
* ci: do a disk cleanup before test
* ci: add llvm cache to speedup installation
* ci: use lld linker for coverage as well
* feat: use lld for release too
