chore: new serde feature instead of deprecated with-serde

[nyurik]

Important changes:

• add a new serde feature and deprecate the with-serde feature, per clippy recommendation

[Copilot]

Pull Request Overview

This PR addresses minor clippy warnings and linting issues in the codebase. The changes focus on fixing spelling errors, improving documentation formatting, and refactoring feature configurations to comply with clippy recommendations.

• Fixed spelling and formatting issues in comments and documentation
• Refactored Cargo.toml feature configuration to address clippy::redundant_feature_names warning
• Updated clippy lint configuration to be more selective about allowed warnings

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
src/parser.rs	Fixed spelling error in comment and improved documentation formatting for C_identifier function
src/lib.rs	Added TODO comment and clippy allow attribute for DBC struct naming
README.md	Added backticks around feature names in markdown list for better formatting
Cargo.toml	Refactored feature configuration and updated clippy lint settings

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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