Implements wiring for Flight to have it's own "HostConfig" (#26590)

Part of #26571

Implements wiring for Flight to have it's own "HostConfig" from Fizz.

Historically the ServerFormatConfigs were supposed to be generic enough
to be used by Fizz and Flight. However with the addition of features
like Float the configs have evolved to be more specific to the renderer.
We may want to get back to a place where there is a pure FormatConfig
which can be shared but for now we are embracing the fact that these
runtimes need very different things and DCE cannot adequately remove the
unused stuff for Fizz when pulling this dep into Flight so we are going
to fork the configs and just maintain separate ones.

At first the Flight config will be almost empty but once Float support
in Flight lands it will have a more complex implementation

Additionally this commit normalizes the component files which make up
FlightServerConfig and FlightClientConfig. Now each file that
participates starts with ReactFlightServerConfig... and
ReactFlightClientConfig...

DiffTrain build for [f4f873f](f4f873f)

compiled/facebook-www/REVISION

@@ -1 +1 @@
-fec97ecbc4bc2e0e1407160289a8f5fac5241cbc
+f4f873f6282e6f2e584990c00fb2aae86db85a8b

compiled/facebook-www/ReactFlightDOMRelayServer-dev.classic.js

@@ -189,9 +189,6 @@ function getIteratorFn(maybeIterable) {
   return null;
 }
 
-// Re-export dynamic flags from the www version.
-require("ReactFeatureFlags");
-
 var rendererSigil;
 
 {
@@ -400,6 +397,9 @@ function readContext$1(context) {
   return value;
 }
 
+// Re-export dynamic flags from the www version.
+require("ReactFeatureFlags");
+
 // Corresponds to ReactFiberWakeable and ReactFizzWakeable modules. Generally,
 // changes to one module should be reflected in the others.
 // TODO: Rename this module and the corresponding Fiber one to "Thenable"

compiled/facebook-www/ReactFlightDOMRelayServer-dev.modern.js

@@ -189,9 +189,6 @@ function getIteratorFn(maybeIterable) {
   return null;
 }
 
-// Re-export dynamic flags from the www version.
-require("ReactFeatureFlags");
-
 var rendererSigil;
 
 {
@@ -400,6 +397,9 @@ function readContext$1(context) {
   return value;
 }
 
+// Re-export dynamic flags from the www version.
+require("ReactFeatureFlags");
+
 // Corresponds to ReactFiberWakeable and ReactFizzWakeable modules. Generally,
 // changes to one module should be reflected in the others.
 // TODO: Rename this module and the corresponding Fiber one to "Thenable"

compiled/facebook-www/ReactFlightDOMRelayServer-prod.classic.js

@@ -60,9 +60,8 @@ var REACT_ELEMENT_TYPE = Symbol.for("react.element"),
     "react.default_value"
   ),
   REACT_MEMO_CACHE_SENTINEL = Symbol.for("react.memo_cache_sentinel"),
-  MAYBE_ITERATOR_SYMBOL = Symbol.iterator;
-require("ReactFeatureFlags");
-var currentActiveSnapshot = null;
+  MAYBE_ITERATOR_SYMBOL = Symbol.iterator,
+  currentActiveSnapshot = null;
 function popToNearestCommonAncestor(prev, next) {
   if (prev !== next) {
     prev.context._currentValue = prev.parentValue;
@@ -142,6 +141,7 @@ function pushProvider(context, nextValue) {
       value: nextValue
     });
 }
+require("ReactFeatureFlags");
 var SuspenseException = Error(
   "Suspense Exception: This is not a real error! It's an implementation detail of `use` to interrupt the current render. You must either rethrow it immediately, or move the `use` call outside of the `try/catch` block. Capturing without rethrowing will lead to unexpected behavior.\n\nTo handle async errors, wrap your component in an error boundary, or call the promise's `.catch` method and pass the result to `use`"
 );

compiled/facebook-www/ReactFlightDOMRelayServer-prod.modern.js

@@ -60,9 +60,8 @@ var REACT_ELEMENT_TYPE = Symbol.for("react.element"),
     "react.default_value"
   ),
   REACT_MEMO_CACHE_SENTINEL = Symbol.for("react.memo_cache_sentinel"),
-  MAYBE_ITERATOR_SYMBOL = Symbol.iterator;
-require("ReactFeatureFlags");
-var currentActiveSnapshot = null;
+  MAYBE_ITERATOR_SYMBOL = Symbol.iterator,
+  currentActiveSnapshot = null;
 function popToNearestCommonAncestor(prev, next) {
   if (prev !== next) {
     prev.context._currentValue = prev.parentValue;
@@ -142,6 +141,7 @@ function pushProvider(context, nextValue) {
       value: nextValue
     });
 }
+require("ReactFeatureFlags");
 var SuspenseException = Error(
   "Suspense Exception: This is not a real error! It's an implementation detail of `use` to interrupt the current render. You must either rethrow it immediately, or move the `use` call outside of the `try/catch` block. Capturing without rethrowing will lead to unexpected behavior.\n\nTo handle async errors, wrap your component in an error boundary, or call the promise's `.catch` method and pass the result to `use`"
 );