DEV: Pass the user who requested the summary to the strategy. (#24489)

This change allows the `discourse-ai` plugin to log the user who requested the summary in the `AiApiAuditLog`.

lib/summarization/base.rb

@@ -75,6 +75,8 @@ module Summarization
     # @param &on_partial_blk { Block - Optional } - If the strategy supports it, the passed block
     # will get called with partial summarized text as its generated.
     #
+    # @param current_user { User } - User requesting the summary.
+    #
     # @returns { Hash } - The summarized content, plus chunks if the content couldn't be summarized in one pass. Example:
     #   {
     #     summary: "This is the final summary",
@@ -83,7 +85,7 @@ module Summarization
     #       { ids: [post_1.post_number, post_2.post_number], summary: "this is the second chunk" },
     #     ],
     #   }
-    def summarize(content)
+    def summarize(content, current_user)
       raise NotImplemented
     end