fix(bluetooth-le): Various methods fixes (#2707)

* feat(bluetooth-le): implemented all available methods and refactored existing ones

* fix(bluetooth-le): Removed @memberof jsdoc annotations to avoid ci check failure

* fix(bluetooth-le): Fixed multiple jsdocs typos/misformats preventing CI to pass checks while generating readmes

* fix(bluetooth-le): Removed package-lock.json

* Update index.ts

* fix(bluetooth-le): Fixed stringToBytes method, now properly takes a string as arg and return an Uint8Array

* fix(bluetooth-le): getAdapterInfo now returns an Observable for easier tracking of adapter states

* fix(bluetooth-le): Fixed missing cordova param (observable: true) in initializePeripheral method, fixed getAdapterInfo method, now return an adapterInfo object

* chore(bluetooth-le): Removed @description markup to allow a proper doc auto-format

* fix(bluetooth-le): Reverted getAdapterInfo method to a Promise return