Ignore ts-rs tests by default

[escritorio-gustavo]

Currently ts-rs exports its TypeScript bindings in every test run. This seems to really upset some people, and with good reasons:

• One cannot run their own tests without triggering ts-rs
• One cannot trigger ts-rs without running their own tests
• Both situations cause slowdowns due to running more tests than expected

So this PR proposes a way to change that by adding #[ignore] to all ts-rs tests. This enables users to:

• Run only their own tests with cargo test
• Run only ts-rs tests with cargo test export_bindings_ -- --ignored
• Run everything with cargo test -- --ignored (though this does have the downside of running the user's own ignored tests)

Fixes #62

[escritorio-gustavo]

As discussed in #251, this will be kept on hold until the CLI release

[escritorio-gustavo]

Obsolete as of #304