feat: field redaction

[cmilesdev]

Changes

• Added configurable field include/exclude filters and redaction options with match modes (exact/contains/prefix/suffix).
• Implemented default sensitive-field redaction list via WithRedactSensitive.
• Applied filtering/redaction in struct rendering and added comprehensive tests for matching and redaction behaviors.

New Options

• WithExcludeFields to omit selected fields.
• WithFieldMatchMode to control include/exclude matching (exact/contains/prefix/suffix).
• WithRedactFields to replace matching fields with .
• WithRedactSensitive to enable a built‑in sensitive‑field list with substring matching.
• WithRedactMatchMode to control redaction matching (exact/contains/prefix/suffix).

This feature is opt‑in by default.

Reasons:

• It would be a breaking/behavior‑changing default for existing users who expect full dumps.
• Default redaction inevitably misses some sensitive fields and may wrongly redact benign fields; users should consciously choose it.
• People use dumps for debugging/forensics; silent redaction can make issues harder to track.

Related issue / request #48

Example

func main() {
	// WithRedactSensitive enables default redaction for common sensitive fields.

	// Example: redact common sensitive fields
	// Default: disabled
	type User struct {
		Password string
		Token    string
	}
	d := godump.NewDumper(
		godump.WithRedactSensitive(),
	)
	d.Dump(User{Password: "secret", Token: "abc"})
	// #godump.User {
	//   +Password => <redacted> #string
	//   +Token    => <redacted> #string
	// }
}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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