Declare the minimum supported Rust version and check it in CI

[LucaCappelletti94]

The crate has no rust-version, so there is no stated minimum Rust and nothing checks one.

By bisection, it turns out that it is 1.88 in practice, as cargo +1.88.0 check builds both feature sets, cargo +1.87.0 check fails.

This PR adds an msrv job that runs cargo check and cargo check --no-default-features on 1.88.0 so the declared value is verified.

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[codacy-production]

Pull Request Overview

The PR establishes a Minimum Supported Rust Version (MSRV) of 1.88 and introduces a dedicated CI workflow to enforce this compatibility. Codacy analysis indicates the changes are up to standards.

While the implementation meets the primary acceptance criteria, the CI check is currently insufficient to prevent MSRV drift in feature-gated code or test-specific dependencies. Specifically, the workflow lacks verification for all feature combinations and non-library targets, which often introduce higher Rust version requirements through transitive dependencies or new language features.

Test suggestions

• Verify the project compiles on the declared MSRV (1.88) with default features.
• Verify the project compiles on the declared MSRV (1.88) with no-default features.
• Verify the project compiles on the declared MSRV (1.88) with all features enabled.
• Verify all targets (tests, examples, benchmarks) compile on the declared MSRV (1.88).

Prompt proposal for missing tests

Consider implementing these tests if applicable:
1. Verify the project compiles on the declared MSRV (1.88) with all features enabled.
2. Verify all targets (tests, examples, benchmarks) compile on the declared MSRV (1.88).

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