[javascript mode] Make TypeScript module/enum contextual keywords
[javascript mode] Make TypeScript module/enum contextual keywords

Closes #5064

SidPresse/CodeMirror,hackmdio/CodeMirror,SidPresse/CodeMirror,jkaplon/CodeMirror,namin/CodeMirror,nightwing/CodeMirror,ficristo/CodeMirror,jayaprabhakar/CodeMirror,thomasjm/CodeMirror,dperetti/CodeMirror,namin/CodeMirror,codio/CodeMirror,notepadqq/CodeMirror,SidPresse/CodeMirror,jayaprabhakar/CodeMirror,wingify/CodeMirror,jkaplon/CodeMirror,notepadqq/CodeMirror,thomasjm/CodeMirror,hackmdio/CodeMirror,ficristo/CodeMirror,pabloferz/CodeMirror,namin/CodeMirror,dperetti/CodeMirror,mtaran-google/CodeMirror,ficristo/CodeMirror,dperetti/CodeMirror,jkaplon/CodeMirror,nightwing/CodeMirror,hackmdio/CodeMirror,wingify/CodeMirror,pabloferz/CodeMirror,nightwing/CodeMirror,wingify/CodeMirror,codio/CodeMirror,thomasjm/CodeMirror,pabloferz/CodeMirror,codio/CodeMirror,notepadqq/CodeMirror,mtaran-google/CodeMirror,mtaran-google/CodeMirror,jayaprabhakar/CodeMirror