Fix: Aliasing UB Reported by Miri

[zjp-CN]

This PR fixes violations of the aliasing rules

• You can see the diagnostics in os-checker or the following diagnostic.
• The problem results from the data NonNull pointer that is constructed from a shared reference ptr.as_ref() and thus all pointers are based it, which is fine as long as no mutation happens. But the mutation does happen in the drop code of Wrapper (i.e. the Box or Arc in the crate). The diagnostic of tree borrows shows it clearer as follows

MIRIFLAGS=-Zmiri-tree-borrows cargo miri test

test linked_list::tests::test_push_back ... error: Undefined Behavior: deallocation through <137613> at alloc42011[0x0] is forbidden
    --> /home/gh-zjp-CN/.rustup/toolchains/nightly-aarch64-unknown-linux-gnu/lib/rustlib/src/rust/library/alloc/src/boxed.rs:1686:17
     |
1686 |                 self.1.deallocate(From::from(ptr.cast()), layout);
     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Undefined Behavior occurred here
     |
     = help: this indicates a potential bug in the program: it performed an invalid operation, but the Tree Borrows rules it violated are still experimental
     = help: see https://github.com/rust-lang/unsafe-code-guidelines/blob/master/wip/tree-borrows.md for further information
     = help: the accessed tag <137613> is a child of the conflicting tag <133189>
     = help: the conflicting tag <133189> has state Frozen which forbids this deallocation (acting as a child write access)
help: the accessed tag <137613> was created here
    --> src/linked_list.rs:233:15
     |
 233 |         while self.pop_front().is_some() {}
     |               ^^^^^^^^^^^^^^^^
help: the conflicting tag <133189> was created here, in the initial state Cell
    --> src/raw_list.rs:162:28
     |
 162 |         let new_ptr = Some(NonNull::from(new));
     |                            ^^^^^^^^^^^^^^^^^^
     = note: BACKTRACE (of the first span) on thread `linked_list::te`:
     = note: inside `<std::boxed::Box<linked_list::tests::Example> as std::ops::Drop>::drop` at /home/gh-zjp-CN/.rustup/toolchains/nightly-aarch64-unknown-linux-gnu/lib/rustlib/src/rust/library/alloc/src/boxed.rs:1686:17: 1686:66
     = note: inside `std::ptr::drop_in_place::<std::boxed::Box<linked_list::tests::Example>> - shim(Some(std::boxed::Box<linked_list::tests::Example>))` at /home/gh-zjp-CN/.rustup/toolchains/nightly-aarch64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ptr/mod.rs:805:1: 807:25
     = note: inside `std::ptr::drop_in_place::<std::option::Option<std::boxed::Box<linked_list::tests::Example>>> - shim(Some(std::option::Option<std::boxed::Box<linked_list::tests::Example>>))` at /home/gh-zjp-CN/.rustup/toolchains/nightly-aarch64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ptr/mod.rs:805:1: 807:25
note: inside `<linked_list::List<std::boxed::Box<linked_list::tests::Example>> as std::ops::Drop>::drop`
    --> src/linked_list.rs:233:40
     |
 233 |         while self.pop_front().is_some() {}
     |                                        ^
     = note: inside `std::ptr::drop_in_place::<linked_list::List<std::boxed::Box<linked_list::tests::Example>>> - shim(Some(linked_list::List<std::boxed::Box<linked_list::tests::Example>>))` at /home/gh-zjp-CN/.rustup/toolchains/nightly-aarch64-unknown-linux-gnu/lib/rustlib/src/rust/library/core/src/ptr/mod.rs:805:1: 807:25
note: inside closure
    --> src/linked_list.rs:342:24
     |
 341 |     #[test]
     |     ------- in this attribute macro expansion
 342 |     fn test_push_back() {
     |                        ^

• Note that this changes some public APIs of RawList, so a new major version 0.3.0 should be released.
• The fix also automatically solves the same aliasing bugs in the axsched's testcases tests::fifo::bench_remove and tests::fifo::test_sched without further efforts.

I set up a step of miri check in CI as well.