[Add] first barematal os for print.

[JinnanChen1211]

Test steps:

1. cargo install bootimage
2. cargo install cargo-xbuild
3. cargo xbuild --target x86_64-cjn_os.json
4. rustup component add llvm-tools-preview
5. cargo bootimage
6. qemu-system-x86_64 -drive format=raw,file=./target/x86_64-cjn_os/debug/bootimage-cjn-os.bin

编译有一个问题：

error[E0464]: multiple candidates for `rmeta` dependency `core` found
 --> /home/rlk/.rustup/toolchains/nightly-2023-06-19-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/rustc-std-workspace-core/lib.rs:4:9
  |
4 | pub use core::*;
  |         ^^^^
  |
  = note: candidate #1: /tmp/cargo-xbuildCn29op/target/x86_64-cjn_os/release/deps/libcore-fa72666d8cd3101a.rmeta
  = note: candidate #2: /tmp/cargo-xbuildCn29op/target/x86_64-cjn_os/release/deps/libcore-4192cf337c736b44.rmeta

For more information about this error, try `rustc --explain E0464`.
error: could not compile `rustc-std-workspace-core` (lib) due to previous error
warning: build failed, waiting for other jobs to finish...

解决办法：

#  you should not add compiler_builtins as dependency yourself. cargo will build it automatically for you.
# https://github.com/rust-lang/compiler-builtins/issues/334
# [unstable]
# build-std = ["core", "compiler_builtins"]
# build-std-features = ["compiler-builtins-mem"]