Add a CRC module which can use the hardware peripherals to perform CRC

[TrentHouliston]

Add a CRC peripheral that can do the dynamixel 2.0 format.
There is room for improvement in the future by using a memory-to-memory DMA.
Or potentially replacing this with a utility lookup (testing showed it can be faster than the peripheral if set up correctly in memory)

[Copilot]

Pull Request Overview

This PR adds a hardware CRC peripheral module to efficiently calculate CRC-16 checksums for Dynamixel 2.0 protocol packets using the STM32H753's hardware CRC unit.

• Implements a hardware-accelerated CRC processor optimized for Dynamixel 2.0 protocol
• Adds a demonstration application comparing hardware vs software CRC performance
• Integrates the new CRC functionality into the main application loop

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/peripherals/mod.rs	Adds module declaration for the new CRC peripheral
src/peripherals/crc.rs	Implements hardware CRC processor with Dynamixel 2.0 configuration
src/main.rs	Integrates CRC demo app into the main application loop
src/apps/mod.rs	Adds module declaration and re-export for CRC demo app
src/apps/crc_demo.rs	Implements demonstration app comparing hardware vs software CRC methods

Comments suppressed due to low confidence (1)

src/apps/crc_demo.rs:175

• The expected CRC value [0x21, 0x51] for the 'Read instruction' test case doesn't match the comment in the hardware implementation example which shows [0x1D, 0x15] for what appears to be the same packet data. This inconsistency should be verified and corrected.

                &[0xFF, 0xFF, 0xFD, 0x00, 0x01, 0x07, 0x00, 0x02, 0x00, 0x00, 0x02, 0x00][..],