fixed clippy issues and cleanup of unnecessary imports

[HJLebbink]

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[Copilot]

Pull Request Overview

This PR addresses clippy warnings and removes unnecessary imports across the codebase. The main changes involve replacing the deprecated hex::ToHex trait with a custom hex_encode function, updating import paths, and consolidating dependencies.

• Replaces hex::ToHex with custom hex_encode implementation for hex encoding operations
• Renames and reorganizes multimap module from multimap to multimap_ext
• Updates dependencies to use workspace-defined versions and removes deprecated crates

Reviewed Changes

Copilot reviewed 55 out of 55 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
src/s3/utils.rs	Adds custom hex_encode function and removes deprecated hex/byteorder dependencies
tests/test_upload_download_object.rs	Updates hex encoding calls to use new custom function
src/s3/*.rs	Updates import paths from multimap to multimap_ext module
macros/src/*.rs	Updates futures imports to use futures_util instead of futures
common/src/*.rs	Updates rand API usage and async trait imports
Cargo.toml	Consolidates dependencies using workspace configuration

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