chore: restore deprecated BigSegmentStatus() accessor as a shim

Author: beekld

libs/common/include/launchdarkly/data/evaluation_reason.hpp

@@ -91,6 +91,13 @@ class EvaluationReason {
      */
     [[nodiscard]] std::optional<BigSegmentsStatus> BigSegmentsStatus() const;
 
+    /**
+     * Deprecated; use BigSegmentsStatus() instead. Always returns std::nullopt.
+     */
+    [[deprecated("use BigSegmentsStatus()")]] [[nodiscard]] std::optional<
+        std::string>
+    BigSegmentStatus() const;
+
     /**
      * The index of the matched rule (0 for the first), if the kind was
      * `"RULE_MATCH"`.

libs/common/src/data/evaluation_reason.cpp

@@ -32,6 +32,10 @@ EvaluationReason::BigSegmentsStatus() const {
     return big_segments_status_;
 }
 
+std::optional<std::string> EvaluationReason::BigSegmentStatus() const {
+    return std::nullopt;
+}
+
 EvaluationReason::EvaluationReason(
     enum Kind kind,
     std::optional<enum ErrorKind> error_kind,