fix: disable default features for compio

[Berrysoft]

No description provided.

[Copilot]

Pull request overview

This PR disables default features for the compio dependency across the workspace to provide more granular control over feature selection and reduce unnecessary dependencies. The changes ensure that only explicitly required features are enabled.

Key changes:

• Add default-features = false to all compio dependency declarations across the workspace
• Add feature gates and allow attributes to handle code that becomes unused when certain features are disabled
• Explicitly specify required features for each crate's usage of compio

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
Cargo.toml	Set default-features = false for workspace-level compio dependency
cyper/Cargo.toml	Disable default features and explicitly list required features (time, bytes, tls)
cyper-core/Cargo.toml	Disable default features and explicitly list required features (io-compat, time)
cyper-axum/Cargo.toml	Disable default features with time feature enabled
cyper/src/util.rs	Add feature gate for fast_random() function (only used with multipart feature)
cyper/src/client.rs	Add #[allow(unused)] for variable that's only used when http3 feature is enabled
cyper/src/backend.rs	Add #[allow(dead_code)] for field that's only used when TLS backends are enabled

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