chore(bundling): bundle for modern browsers (#3342)

* chore(bundling): update babel dependencies

* chore(bundling): remove babel-plugin-transform-async-to-promises

we don't use async functions, and we also want to target envs that support async functions

* chore(bundling): update supported browsers

for a more modern output

* chore(bundling): tweak browserslist

and exclude transform-parameters plugin, which comes in because of any safari version, even though it should not be needed according to caniuse. This plugin transforms ES2015 parameters to ES5, this includes: Destructuring parameters, Default parameters and Rest parameters, all of which are supported by Safari

* chore(bundling): update terser

* chore(bundling): fix tests

ReferenceError: Cannot access 'promiseResolve' before initialization

* chore(bundling): docs about supported browsers

* chore(bundling): small docs fixes