Switch ex_slop to plugin-based config

Replace 39 individual ExSlop checks with the {ExSlop, []}
plugin that registers 30 recommended checks automatically.

.credo.exs

@@ -2,47 +2,9 @@
   configs: [
     %{
       name: "default",
+      plugins: [{ExSlop, []}],
       checks: %{
         extra: [
-          {ExSlop.Check.Warning.BlanketRescue, []},
-          {ExSlop.Check.Warning.RescueWithoutReraise, []},
-          {ExSlop.Check.Warning.RepoAllThenFilter, []},
-          {ExSlop.Check.Warning.QueryInEnumMap, []},
-          {ExSlop.Check.Warning.GenserverAsKvStore, []},
-          {ExSlop.Check.Warning.PathExpandPriv, []},
-          {ExSlop.Check.Warning.DualKeyAccess, []},
-          {ExSlop.Check.Refactor.FilterNil, []},
-          {ExSlop.Check.Refactor.RejectNil, []},
-          {ExSlop.Check.Refactor.ReduceAsMap, []},
-          {ExSlop.Check.Refactor.MapIntoLiteral, []},
-          {ExSlop.Check.Refactor.IdentityPassthrough, []},
-          {ExSlop.Check.Refactor.IdentityMap, []},
-          {ExSlop.Check.Refactor.CaseTrueFalse, []},
-          {ExSlop.Check.Refactor.TryRescueWithSafeAlternative, []},
-          {ExSlop.Check.Refactor.WithIdentityElse, []},
-          {ExSlop.Check.Refactor.WithIdentityDo, []},
-          {ExSlop.Check.Refactor.SortThenReverse, []},
-          {ExSlop.Check.Refactor.StringConcatInReduce, []},
-          {ExSlop.Check.Refactor.ReduceMapPut, []},
-          {ExSlop.Check.Refactor.RedundantBooleanIf, []},
-          {ExSlop.Check.Refactor.FlatMapFilter, []},
-          {ExSlop.Check.Refactor.RedundantEnumJoinSeparator, []},
-          {ExSlop.Check.Refactor.UseMapJoin, []},
-          {ExSlop.Check.Refactor.PreferEnumSlice, []},
-          {ExSlop.Check.Refactor.GraphemesLength, []},
-          {ExSlop.Check.Refactor.ManualStringReverse, []},
-          {ExSlop.Check.Refactor.SortThenAt, []},
-          {ExSlop.Check.Refactor.SortForTopK, []},
-          {ExSlop.Check.Refactor.ListFold, []},
-          {ExSlop.Check.Refactor.LengthInGuard, []},
-          {ExSlop.Check.Refactor.ExplicitSumReduce, []},
-          {ExSlop.Check.Readability.NarratorDoc, []},
-          {ExSlop.Check.Readability.DocFalseOnPublicFunction, []},
-          {ExSlop.Check.Readability.BoilerplateDocParams, []},
-          {ExSlop.Check.Readability.ObviousComment, [additional_keywords: []]},
-          {ExSlop.Check.Readability.StepComment, []},
-          {ExSlop.Check.Readability.NarratorComment, []},
-          {ExSlop.Check.Readability.UnaliasedModuleUse, []},
           {Credo.Check.Refactor.Nesting, max_nesting: 3},
           {Credo.Check.Readability.ModuleDoc,
            ignore_names: [