feat(config): move Fevm.Events->Events, implement soft deprecation

Closes: https://github.com/filecoin-project/lotus/issues/11679

* Introduce a `moved:"To.New.Config"` tag which prints a stderr warning when
  you use one of these, but will move any set value to the new location if the
	new location isn't already set itself.
* Look for `X is DEPRECATED` to hold certain fields back from documentation.
* Use `toml:"omitempty"` to prevent the default config output from having these
  deprecated values.

node/config/def.go

@@ -110,17 +110,15 @@ func DefaultFullNode() *FullNode {
 		Fevm: FevmConfig{
 			EnableEthRPC:                 false,
 			EthTxHashMappingLifetimeDays: 0,
-			Events: Events{
-				DisableRealTimeFilterAPI: false,
-				DisableHistoricFilterAPI: false,
-				FilterTTL:                Duration(time.Hour * 24),
-				MaxFilters:               100,
-				MaxFilterResults:         10000,
-				MaxFilterHeightRange:     2880, // conservative limit of one day
-			},
 		},
 		Events: EventsConfig{
-			EnableActorEventsAPI: false,
+			DisableRealTimeFilterAPI: false,
+			DisableHistoricFilterAPI: false,
+			EnableActorEventsAPI:     false,
+			FilterTTL:                Duration(time.Hour * 24),
+			MaxFilters:               100,
+			MaxFilterResults:         10000,
+			MaxFilterHeightRange:     2880, // conservative limit of one day
 		},
 	}
 }