Fix CI and clippy issues

[dd23]

This PR does the following:

• updates minimum Rust version to 1.70, as needed by some dependencies - this made CI fail
• removes the custom impl of Eq and PartialEq and instead derives them (similar to Hash) to avoid this Clippy warning
• fixes Clippy warnings re lifetimes that show up in more recent Rust versions

[WanzenBug]

Thanks for the contribution! I don't want to bump the MSRV if we don't have to, so I'd rahter fix the CI workflow than bumping it.

[WanzenBug]

cargo +1.61.0 check

Runs just fine. Issue seems to be running cargo +1.61.0 test, which I'd say can be ignored. I guess that means the CI setup should be updated so it only runs check in the MSRV case.

[dd23]

In that case, I think we need to pin dependencies to an older version, cause I get

error: package textwrap v0.16.2 cannot be built because it requires rustc 1.70 or newer, while the currently active rustc version is 1.61.0

when trying to run the tests with cargo +1.61.0 test

[WanzenBug]

Yes. the dev-dependecies are no longer compatible with 1.61.0. So you cannot run cargo +1.61.0 test. But you can still run cargo +1.61.0 check. So g2p will run just fine with the older rust version, it's just that we can't test it with the current tests :/

[dd23]

I added a Cargo.lock file, with dependencies set to versions that are compatible with 1.61. With this the tests should work fine when run with cargo +1.61.0 test

[WanzenBug]

LGTM!

Thank you!