Add file and memory mapping syscalls to macOS shim

[Sangho Lee (sangho2)]

This PR adds file and memory mapping syscalls to the macOS shim.

[github-actions]

🤖 SemverChecks 🤖 ⚠️ Potential breaking API changes detected ⚠️

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--- failure enum_no_repr_variant_discriminant_changed: enum variant had its discriminant change value ---

Description:
The enum's variant had its discriminant value change. This breaks downstream code that used its value via a numeric cast like `as isize`.
        ref: https://doc.rust-lang.org/reference/items/enumerations.html#assigning-discriminant-values
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.50.0/src/lints/enum_no_repr_variant_discriminant_changed.ron

Failed in:
  variant SyscallRequest::Close 3 -> 4 in /home/runner/work/litebox/litebox/litebox_common_macos/src/syscall.rs:84
  variant SyscallRequest::Dup 4 -> 5 in /home/runner/work/litebox/litebox/litebox_common_macos/src/syscall.rs:87
  variant SyscallRequest::Getpid 5 -> 9 in /home/runner/work/litebox/litebox/litebox_common_macos/src/syscall.rs:107
  variant SyscallRequest::Getppid 6 -> 10 in /home/runner/work/litebox/litebox/litebox_common_macos/src/syscall.rs:108
  variant SyscallRequest::Getuid 7 -> 11 in /home/runner/work/litebox/litebox/litebox_common_macos/src/syscall.rs:109
  variant SyscallRequest::Geteuid 8 -> 12 in /home/runner/work/litebox/litebox/litebox_common_macos/src/syscall.rs:110
  variant SyscallRequest::Getgid 9 -> 13 in /home/runner/work/litebox/litebox/litebox_common_macos/src/syscall.rs:111
  variant SyscallRequest::Getegid 10 -> 14 in /home/runner/work/litebox/litebox/litebox_common_macos/src/syscall.rs:112
  variant SyscallRequest::MachAbsoluteTime 11 -> 15 in /home/runner/work/litebox/litebox/litebox_common_macos/src/syscall.rs:113
  variant SyscallRequest::MachTimebaseInfo 12 -> 16 in /home/runner/work/litebox/litebox/litebox_common_macos/src/syscall.rs:114
  variant SyscallRequest::MachWaitUntil 13 -> 17 in /home/runner/work/litebox/litebox/litebox_common_macos/src/syscall.rs:117
  variant SyscallRequest::Close 3 -> 4 in /home/runner/work/litebox/litebox/litebox_common_macos/src/syscall.rs:84
  variant SyscallRequest::Dup 4 -> 5 in /home/runner/work/litebox/litebox/litebox_common_macos/src/syscall.rs:87
  variant SyscallRequest::Getpid 5 -> 9 in /home/runner/work/litebox/litebox/litebox_common_macos/src/syscall.rs:107
  variant SyscallRequest::Getppid 6 -> 10 in /home/runner/work/litebox/litebox/litebox_common_macos/src/syscall.rs:108
  variant SyscallRequest::Getuid 7 -> 11 in /home/runner/work/litebox/litebox/litebox_common_macos/src/syscall.rs:109
  variant SyscallRequest::Geteuid 8 -> 12 in /home/runner/work/litebox/litebox/litebox_common_macos/src/syscall.rs:110
  variant SyscallRequest::Getgid 9 -> 13 in /home/runner/work/litebox/litebox/litebox_common_macos/src/syscall.rs:111
  variant SyscallRequest::Getegid 10 -> 14 in /home/runner/work/litebox/litebox/litebox_common_macos/src/syscall.rs:112
  variant SyscallRequest::MachAbsoluteTime 11 -> 15 in /home/runner/work/litebox/litebox/litebox_common_macos/src/syscall.rs:113
  variant SyscallRequest::MachTimebaseInfo 12 -> 16 in /home/runner/work/litebox/litebox/litebox_common_macos/src/syscall.rs:114
  variant SyscallRequest::MachWaitUntil 13 -> 17 in /home/runner/work/litebox/litebox/litebox_common_macos/src/syscall.rs:117

--- failure enum_variant_added: enum variant added on exhaustive enum ---

Description:
A publicly-visible enum without #[non_exhaustive] has a new variant.
        ref: https://doc.rust-lang.org/cargo/reference/semver.html#enum-variant-new
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.50.0/src/lints/enum_variant_added.ron

Failed in:
  variant Errno:ENAMETOOLONG in /home/runner/work/litebox/litebox/litebox_common_macos/src/errno.rs:66
  variant SyscallRequest:Open in /home/runner/work/litebox/litebox/litebox_common_macos/src/syscall.rs:79
  variant SyscallRequest:Mmap in /home/runner/work/litebox/litebox/litebox_common_macos/src/syscall.rs:90
  variant SyscallRequest:Munmap in /home/runner/work/litebox/litebox/litebox_common_macos/src/syscall.rs:98
  variant SyscallRequest:Mprotect in /home/runner/work/litebox/litebox/litebox_common_macos/src/syscall.rs:102
  variant SyscallRequest:Open in /home/runner/work/litebox/litebox/litebox_common_macos/src/syscall.rs:79
  variant SyscallRequest:Mmap in /home/runner/work/litebox/litebox/litebox_common_macos/src/syscall.rs:90
  variant SyscallRequest:Munmap in /home/runner/work/litebox/litebox/litebox_common_macos/src/syscall.rs:98
  variant SyscallRequest:Mprotect in /home/runner/work/litebox/litebox/litebox_common_macos/src/syscall.rs:102

--- failure feature_missing: package feature removed or renamed ---

Description:
A feature has been removed from this package's Cargo.toml. This will break downstream crates which enable that feature.
        ref: https://doc.rust-lang.org/cargo/reference/semver.html#cargo-feature-remove
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.50.0/src/lints/feature_missing.ron

Failed in:
  feature test-stdio in the package's Cargo.toml