Moved typings dependencies to devDependencies

[emiyake]

@types/* should be added as devDependencies.

Otherwise, it could conflict with different versions of @type definition in the project, as follows:

./node_modules/react-native-masked-text/node_modules/@types/react-native/globals.d.ts(66,3): error TS2717: Subsequent property declarations must have the same type.  Property 'body' must be of type 'string | ArrayBuffer | ArrayBufferView | Blob | FormData', but here has type 'BodyInit_'.
./node_modules/react-native-masked-text/node_modules/@types/react-native/globals.d.ts(92,14): error TS2300: Duplicate identifier 'RequestInfo'.
./node_modules/react-native-masked-text/node_modules/@types/react-native/globals.d.ts(111,13): error TS2403: Subsequent variable declarations must have the same type.  Variable 'Response' must be of type '{ new (body?: any, init?: ResponseInit): Response; prototype: Response; error: () => Response; re...', but here has type '{ new (body?: BodyInit_, init?: ResponseInit): Response; prototype: Response; error: () => Respon...'.
./node_modules/react-native-masked-text/node_modules/@types/react-native/index.d.ts(9010,11): error TS2451: Cannot redeclare block-scoped variable 'console'.
./node_modules/react-native-masked-text/node_modules/@types/react-native/index.d.ts(9021,11): error TS2451: Cannot redeclare block-scoped variable 'navigator'.
./node_modules/react-native-masked-text/node_modules/@types/react-native/index.d.ts(9031,11): error TS2451: Cannot redeclare block-scoped variable 'originalXMLHttpRequest'.
./node_modules/react-native-masked-text/node_modules/@types/react-native/index.d.ts(9033,11): error TS2451: Cannot redeclare block-scoped variable '__BUNDLE_START_TIME__'.
./node_modules/react-native-masked-text/node_modules/@types/react-native/index.d.ts(9034,11): error TS2451: Cannot redeclare block-scoped variable 'ErrorUtils'.
./node_modules/react-native-masked-text/node_modules/@types/react-native/index.d.ts(9041,11): error TS2451: Cannot redeclare block-scoped variable '__DEV__'.