security(deps): remove vulnerable xmas-elf dependency via embuild (#414)

* security(deps): remove vulnerable xmas-elf dependency via embuild

* chore(deps): update dependencies and improve ESP-IDF compatibility

- Updated `bindgen`, `embassy-sync`, `embedded-svc`, and `embuild` versions in `Cargo.lock`.
- Added patch section in `Cargo.toml` to use latest esp-rs crates for better compatibility with ESP-IDF 5.x.
- Enhanced README with updated prerequisites and build instructions for Python and Rust tools.
- Introduced `rust-toolchain.toml` to pin nightly Rust and added necessary components.
- Modified GPIO handling in `main.rs` to improve pin management and added support for 64-bit time_t in ESP-IDF.
- Updated `.cargo/config.toml` for new linker and runner configurations.

* docs: add detailed setup guide for ESP32 firmware and link in README

- Introduced a new `SETUP.md` file with comprehensive step-by-step instructions for building and flashing the ZeroClaw ESP32 firmware.
- Updated `README.md` to include a link to the new setup guide for easier access to installation and troubleshooting information.

* chore: update .gitignore and refactor main.rs for improved readability

- Added .embuild/ to .gitignore to exclude ESP32 build cache.
- Refactored code in main.rs for better readability by adjusting the formatting of the handle_request function call.

* docs: add newline for better readability in README.md

- Added a newline in the protocol section of README.md to enhance clarity and formatting.

* chore: configure workspace settings in Cargo.toml

- Added workspace configuration to `Cargo.toml` with members and resolver settings for improved project management.

---------

Co-authored-by: ehushubhamshaw <eshaw1@wpi.edu>
Co-authored-by: Will Sarg <12886992+willsarg@users.noreply.github.com>

firmware/zeroclaw-esp32/.cargo/config.toml

@@ -2,4 +2,10 @@
 target = "riscv32imc-esp-espidf"
 
 [target.riscv32imc-esp-espidf]
+linker = "ldproxy"
 runner = "espflash flash --monitor"
+# ESP-IDF 5.x uses 64-bit time_t
+rustflags = ["-C", "default-linker-libraries", "--cfg", "espidf_time64"]
+
+[unstable]
+build-std = ["std", "panic_abort"]