Move things around

[tomaka]

This PR is relatively big but straight-forward.

It moves the src directory to lib/src, and all the subdirectories of bin to the root. The chain specs have been moved to a new directory called demo-chain-specs.

I think that this "flat" layout of the various components of the project is better for the comprehension of people who aren't familiar with the source code.

[tomaka]

Due to the way the wasm-node-size-diff CI stage works (it checks out the base branch and compiles it), this change will be done in two steps. Another PR will be opened afterwards to remove one remaining /bin

[github-actions]

twiggy diff report

Difference in .wasm size before and after this pull request.

---

 Delta Bytes │ Item
─────────────┼─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
     +116100 ┊ smoldot_light::json_rpc_service::Background<TPlat>::handle_request::{{closure}}::h3cbce3d07acc0b17
     -116087 ┊ smoldot_light::json_rpc_service::Background<TPlat>::handle_request::{{closure}}::h3a82bcfadf92d7e8
      -50628 ┊ smoldot::executor::host::ReadyToRun::run_once::h69c3eb4e39dd0256
      +50628 ┊ smoldot::executor::host::ReadyToRun::run_once::h76e21e5c96aa7c73
      +47476 ┊ smoldot::json_rpc::methods::MethodCall::from_defs::hb7959edf5b312d9a
      -47476 ┊ smoldot::json_rpc::methods::MethodCall::from_defs::hbe96c6c6a940cf29
      +14067 ┊ <core::panic::unwind_safe::AssertUnwindSafe<F> as core::future::future::Future>::poll::h7afc65fb424d56c7
      -14067 ┊ <core::panic::unwind_safe::AssertUnwindSafe<F> as core::future::future::Future>::poll::h86fa42ec3e3eddf2
      +13152 ┊ smoldot::executor::vm::interpreter::InterpreterPrototype::new::h9c5b0124aca39e73
      -13152 ┊ smoldot::executor::vm::interpreter::InterpreterPrototype::new::hd30d281016c2bb33
      +13105 ┊ smoldot_light::transactions_service::background_task::{{closure}}::had59f353057e7953
      -13105 ┊ smoldot_light::transactions_service::background_task::{{closure}}::he4662f6f9d88e56f
      -11917 ┊ futures_util::abortable::Abortable<T>::try_poll::hc7d0a64e77f374e5
      +11909 ┊ futures_util::abortable::Abortable<T>::try_poll::h62d809c406b656fd
      +11514 ┊ smoldot_light::sync_service::standalone::start_standalone_chain::{{closure}}::h4c7d7be6cdd911bc
      -11514 ┊ smoldot_light::sync_service::standalone::start_standalone_chain::{{closure}}::hd992f2e22bc05c0d
      -11345 ┊ smoldot_light::json_rpc_service::chain_head::<impl smoldot_light::json_rpc_service::Background<TPlat>>::chain_head_call::{{closure}}::{{closure}}::h4655ddf19b521f9f
      +11345 ┊ smoldot_light::json_rpc_service::chain_head::<impl smoldot_light::json_rpc_service::Background<TPlat>>::chain_head_call::{{closure}}::{{closure}}::hd9114110c17955a2
      +10949 ┊ smoldot_light::Client<TPlat,TChain>::add_chain::h8b5fb75e86a4bbd0
      -10949 ┊ smoldot_light::Client<TPlat,TChain>::add_chain::hfab886f9c3a4d416
        +677 ┊ ... and 22987 more.
       +3070 ┊ Σ [23007 Total Rows]