refactor: Add simple clang-tidy readability checks (#6556)

This change enables the following clang-tidy checks:
-  readability-avoid-nested-conditional-operator,
-  readability-avoid-return-with-void-value,
-  readability-braces-around-statements,
-  readability-const-return-type,
-  readability-container-contains,
-  readability-container-size-empty,
-  readability-else-after-return,
-  readability-make-member-function-const,
-  readability-redundant-casting,
-  readability-redundant-inline-specifier,
-  readability-redundant-member-init,
-  readability-redundant-string-init,
-  readability-reference-to-constructed-temporary,
-  readability-static-definition

src/test/csf/impl/ledgers.cpp

@@ -58,7 +58,9 @@ mismatch(Ledger const& a, Ledger const& b)
             count -= step + Seq{1};
         }
         else
+        {
             count = step;
+        }
     }
     return start;
 }
@@ -88,9 +90,13 @@ LedgerOracle::accept(
     next.closeTimeResolution = closeTimeResolution;
     next.closeTimeAgree = consensusCloseTime != NetClock::time_point{};
     if (next.closeTimeAgree)
+    {
         next.closeTime = effCloseTime(consensusCloseTime, closeTimeResolution, parent.closeTime());
+    }
     else
+    {
         next.closeTime = parent.closeTime() + 1s;
+    }
 
     next.parentCloseTime = parent.closeTime();
     next.parentID = parent.id();