Disallow requiring from invariant/warning (#19634)

Summary:
In this repo we have to require from fbjs/lib/invariant and issues occur when we require directly from invariant/warning. Flow doesn't complain about those requires right now because we have a transitive dependency on invariant and warning causing them to happen to be at the root of node_modules.

This change blacklists requiring directly from invariant and warning using Flow. janicduplessis opened a pull request to do this with ESLint back in 2017: #13014
Closes #19634

Reviewed By: hramos

Differential Revision: D8343060

Pulled By: TheSavior

fbshipit-source-id: 9cfc7915b2fb68a567355fc2f5edc4dfcd46f4af

Author: elicwhite

.flowconfig

@@ -25,6 +25,11 @@
 ; Ignore metro
 .*/node_modules/metro/.*
 
+; These should not be required directly
+; require from fbjs/lib instead: require('fbjs/lib/invariant')
+.*/node_modules/invariant/.*
+.*/node_modules/warning/.*
+
 [include]
 
 [libs]