`tns preview` does not handle custom binary files

[ventsislav-georgiev]

Is your feature request related to a problem? Please describe.

The tns preview command syncs files based on their file extension. If the file is binary it should be sent as base64 encoded file. Currently the check is based on a third party dependency istextorbinary

nativescript-cli/lib/services/livesync/playground/preview-app-files-service.ts

Line 65 in 8722364

binary = isTextOrBinary.isBinarySync(file);

This lib only supports a limited set of binary extensions
https://github.com/bevry/binaryextensions/blob/master/source/index.json

Describe the solution you'd like

Add a parameter to the command to allow adding additional extensions that must be handled as binary.