chore: use quote crate to handle str escaping

[nyurik]

while the previous method was accurate, it created some mismatches with the future quote/syn method of code generation. The new one avoids escaping characters that do not need to be escaped.

Note that quote is not a new dependency - it was already used as a sub-dependency. We just declare it explicitly.

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/lib.rs	50.00%	0 Missing and 2 partials ⚠️

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[Copilot]

Pull request overview

This PR refactors string escaping in the code generator to use the quote crate's ToTokens trait instead of escape_default(). The change improves consistency with standard Rust code generation practices and avoids unnecessarily escaping characters like single quotes (') in generated string literals.

Changes:

• Replaced escape_default() with quote::ToTokens::to_token_stream() for generating string literals
• Added explicit dependency on the quote crate (version 1.0) to Cargo.toml
• Updated snapshot tests to reflect the cleaner string escaping (e.g., ' instead of \')

Reviewed changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/lib.rs	Replaced escape_default() with to_token_stream() for DBC_FILE_NAME and DBC_FILE_VERSION constants; added use quote::ToTokens
Cargo.toml	Added explicit quote = "1.0" dependency
Cargo.lock	Updated to include quote as a direct dependency of dbc-codegen
tests-snapshots/dbc-cantools/no_signals.snap.rs	Updated snapshot to show unescaped single quote in version string
tests-snapshots/dbc-cantools/floating_point.snap.rs	Updated snapshot to show unescaped single quote in version string
tests-snapshots/dbc-cantools/emc32.snap.rs	Updated snapshot to show unescaped single quote in version string
tests-snapshots/dbc-cantools/dump_signal_choices.snap.rs	Updated snapshot to show unescaped single quote in version string

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