Create optimize-messages.rst

Author: Andrea-gm

news/optimize-messages.rst

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+**Added:**
+
+* 'SNMFOptimizer.objective_log' attr: dictionary list to track the optimization
+  process, recording the step, iteration, objective, and timestamp at each update.
+  Uses the 'step', 'iteration', 'objective' and 'timestamp' keys.
+* 'SNMFOptimizer(verbose : Optional[bool])' option and SNMFOptimizer.verbose
+  attribute to allow users to toggle diagnostic console output.
+
+**Changed:**
+
+* Modified all print messages for improved readability and tied them to the new
+  verbose flag.
+* Refactored convergence checks and step-size calculations to pull objective
+  values directly from objective_log instead of relying on a separate history
+  array.
+
+**Deprecated:**
+
+* <news item>
+
+**Removed:**
+
+* Removed the 'SNMFOptimizer._objective_history' list, which was made redundant
+  by the comprehensive 'SNMFOptimizer.objective_log' tracking system.
+
+**Fixed:**
+
+* <news item>
+
+**Security:**
+
+* <news item>