Add eza 0.21.2 benchmark

[Kobzol]

The exa crate is no longer maintained, it has been replaced with the eza fork. I had to remove the lib.rs file, because rustc-perf can't deal with crates that have both a library and a binary default target.

The crate is now much larger and takes longer to compile:

time -p CARGO_INCREMENTAL=0 cargo check ; cargo clean
# 8.09
# 20.10

time -p CARGO_INCREMENTAL=0 cargo build ; cargo clean
# 9.37
# 30.94

time -p CARGO_INCREMENTAL=0 cargo build --release ; cargo clean
# 26.22
# 73.31

Related issue: #2024

[nnethercote]

The crate is now much larger and takes longer to compile

Seems to be a running theme...

There's an EUPL? Huh.

Why remove the CoC?

[Kobzol]

The CoC was licensed under a different license that we didn't yet have in this repo, so I'd have to add it to the LICENSES directory. Seemed easier to just remove the file. But if you think we shouldn't modify the repo I can add it back with the license.

[nnethercote]

Yeah, adding the license is probably better, shouldn't be that hard.

[Kobzol]

Ok, added the missing licenses.