List /users/<user_id>/application-passwords

[oguzkocer]

Adds List variant of /application_passwords using the new #[derive(WpDerivedRequest)]. It adds unit tests to validate the generated list & filter_list endpoint urls and integration tests to validate list & filter_list request executor implementations.

Note that there are some minor inconveniences in this PR, specifically related to how the ApplicationPasswordsRequestExecutor is built. These will be addressed once the changes from WpDerivedRequest is complete.

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To Test

• make test-server && make dump-mysql && make backup-wp-content-plugins
• cargo test --test '*' -- --test-threads 1

[jkmassel]

Reviewed via Slack - needs one followup to address idents – to come later.