feat: init vortex

[gaius-qi]

Description

This pull request introduces several significant changes to the Vortex protocol, including updates to dependencies, protocol documentation, error handling, and the implementation of the Vortex packet structure. Below is a summary of the most important changes:

Dependency Updates:

• Added thiserror, rand, and bytes dependencies in Cargo.toml to support error handling, random number generation, and byte manipulation.

Protocol Documentation:

• Updated docs/README.md to reflect changes in the protocol fields, including increasing the Tag field to 8 bits and the Length field to 32 bits, allowing for up to 4GiB of data.

Error Handling:

• Introduced a new Error enum and Result type in src/error/mod.rs for better error management within the Vortex protocol.

Vortex Packet Implementation:

• Implemented the Vortex enum and related methods in src/lib.rs to represent different types of Vortex packets, including DownloadPiece, PieceContent, Reserved, and Error. Added methods for creating, parsing, and converting Vortex packets to and from byte slices.

DownloadPiece Implementation:

• Added DownloadPiece struct and its associated methods in src/tlv/download_piece.rs to handle download piece requests, including methods for converting to and from byte slices.

Related Issue

dragonflyoss/dragonfly#3753

Motivation and Context

Screenshots (if appropriate)

[CormickKneey]

LGTM