asin, acos, atan functions seem not implemented

[dacalabrese]

Issue

It seems asin, acos, atan functions are not implemented

Description

I came across this issue while using the UQL parser within a grafana-infinity-datasource query.

I'm using version 0.0.23.

While trying to apply the following transformation:

extend "lat"=asin("ratio")

I get a not implemented error.

In fact, it seems that such functions are not implemented in utils.ts.