Add dual-context rewriting for dyld shared cache

[Sangho Lee (sangho2)]

This PR adds dual-context (guest and host) rewriting support for the dyld shared cache. Unlike Linux, macOS combines core system libraries into a single file, known as a shared cache, managed dyld. Maintaining a separate guest copy of it is challenging due to both its size (several gigabytes) and pointer authentication code (PAC) usage. This PR addresses these issues by allowing guest and host to share the same shared cache while selectively handling thread pointer access.

[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 GateMetadata::MsrTpidr 2 -> 3 in /home/runner/work/litebox/litebox/litebox_syscall_rewriter/src/aarch64.rs:574
  variant GateMetadata::X18 3 -> 4 in /home/runner/work/litebox/litebox/litebox_syscall_rewriter/src/aarch64.rs:580
  variant GateMetadata::X18CompareBranch 4 -> 5 in /home/runner/work/litebox/litebox/litebox_syscall_rewriter/src/aarch64.rs:585
  variant GateMetadata::X18Adr 5 -> 6 in /home/runner/work/litebox/litebox/litebox_syscall_rewriter/src/aarch64.rs:590
  variant GateMetadata::X18Branch 6 -> 7 in /home/runner/work/litebox/litebox/litebox_syscall_rewriter/src/aarch64.rs:595
  variant GateMetadata::X18StackWriteback 7 -> 8 in /home/runner/work/litebox/litebox/litebox_syscall_rewriter/src/aarch64.rs:597

--- 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 GateMetadata:HostAwareMrsTpidr in /home/runner/work/litebox/litebox/litebox_syscall_rewriter/src/aarch64.rs:572