[DRAFT] Support Windows userland broker

[Weiteng Chen (CvvT)]

Add broker support for Linux guests running in Windows userland.

• Add a Windows broker transport using named pipes for setup and shared memory for active communication.
• Add end-to-end coverage for static, dynamic, threaded, and concurrent pipe workloads.

[github-actions]

🤖 SemverChecks 🤖 ⚠️ Potential breaking API changes detected ⚠️

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--- failure constructible_struct_adds_field: struct exhaustively constructible through public API adds field ---

Description:
A pub struct that could be exhaustively constructed with a literal using only public API has a new pub field, breaking existing exhaustive literals.
        ref: https://doc.rust-lang.org/reference/expressions/struct-expr.html
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.50.0/src/lints/constructible_struct_adds_field.ron

Failed in:
  field CliArgs.broker_control_channel in /home/runner/work/litebox/litebox/litebox_runner_linux_userland/src/lib.rs:84

--- failure struct_pub_field_missing: pub struct's pub field removed or renamed ---

Description:
A publicly-visible struct has at least one public field that is no longer available under its prior name. It may have been renamed or removed entirely.
        ref: https://doc.rust-lang.org/cargo/reference/semver.html#item-remove
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.50.0/src/lints/struct_pub_field_missing.ron

Failed in:
  field broker_control_socket of struct CliArgs, previously in file /home/runner/work/litebox/litebox/target/semver-checks/git-ulitebox/4e45575785c6f050092cd2e5c2d8891dc41b0d8f/litebox_runner_linux_userland/src/lib.rs:84