facet-rs / facet / 19902770885

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Add floating-point tolerance options to assert_same via builder pattern

Implements #1009: Adds a new `SameOptions` builder and `assert_same_with!`
macro to support floating-point tolerance in structural comparisons.

Key changes:
- Add `SameOptions` struct with `float_tolerance(f64)` builder method
- Add `check_same_with()` function that accepts options
- Add `assert_same_with!` and `debug_assert_same_with!` macros
- Update `Differ` to hold options and use tolerance when comparing floats
- Support tolerance for both f32 and f64 scalar types
- Support tolerance in DynamicValue number comparisons

Example usage:
```rust
use facet_assert::{assert_same_with, SameOptions};

let a = 1.0000001_f64;
let b = 1.0000002_f64;

// With tolerance:
assert_same_with!(a, b, SameOptions::new().float_tolerance(1e-6));
```

The builder pattern allows for future extensibility without breaking changes.

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