Promote performance knowledge from community to Microsoft layer

Pure git-mv relocation of all 7 performance articles from community/knowledge/performance/ to microsoft/knowledge/performance/. No content changes.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

microsoft/knowledge/performance/load-common-fields-before-branching-on-case.good.al

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+codeunit 50100 "Sales Document Processor"
+{
+    procedure ProcessDocument(var SalesHeader: Record "Sales Header")
+    begin
+        // Tier 1: the discriminator and any fields every branch reads.
+        SalesHeader.SetLoadFields("Document Type", "No.", "Sell-to Customer No.");
+
+        case SalesHeader."Document Type" of
+            SalesHeader."Document Type"::Order:
+                begin
+                    // Tier 2: extend the load only on the branch that needs these fields.
+                    SalesHeader.SetLoadFields("Order Date", "Shipment Date", "Completely Shipped");
+                    ProcessOrder(SalesHeader);
+                end;
+            SalesHeader."Document Type"::Invoice:
+                begin
+                    SalesHeader.SetLoadFields("Posting Date", "Amount Including VAT");
+                    ProcessInvoice(SalesHeader);
+                end;
+        end;
+    end;
+
+    local procedure ProcessOrder(var SalesHeader: Record "Sales Header") begin end;
+    local procedure ProcessInvoice(var SalesHeader: Record "Sales Header") begin end;
+}