first pass at typescript conversion with a few tests

[garyhuntddn]

This is a first pass at the typescript conversion of js-utils based on a similar methodology to jitsi-logger and lib-jitsi-meet.

Lots of tests to add before it's ready to be tried out

[garyhuntddn]

@saghul just thought I'd add this to your radar :-)

Depending upon your opinion my preference would be to drop jasmine and use jest as the test engine in both this and the jitsi-logger - what do you think?

Note - I've not attempted to get the build actions correct for this - the original expected things to be in the root folder, whereas this one will follow the norm and build into the /lib folder. I'll likely need a bit of help getting that up and running correctly.