editoast: move schemas/train_schedule.rs in schemas/paced_train.rs

[younesschrifi]

2 commits (will be squash later) to facilitate the review.

first commit: Copy everything from train_schedule.rs in paced_train.rs

second commit: remove train_schedule.rs and fix errors

[github-actions]

⚠️ API changes

This Pull Request introduces some changes in the API:

• please own it: notify or even prepare dedicated PR(s) to consumer projects

Changes in Schemas

Dear @younesschrifi, please ensure the following:

• changes should match in osrd_schemas and editoast schemas
• the RailJSON version in osrd_schemas::infra.py and editoast schemas::infra::railjson.rs should match and be bumped on any change of infra schemas (same goes for rolling-stock between osrd_schemas::rolling_stock.py and editoast schemas::rolling_stock.rs)
• the version of the Python package in osrd_schemas::pyproject.toml should be bumped on any change

[younesschrifi]

not needed anymore