JS: Add ClientRequest models for apollo-client libraries

[erik-krogh]

An evaluation looks OK.
There is a slight hint of a performance regression.
The evaluation ran on CommandInjection.ql, FileAccessToHttp.ql, InsecureDownload.ql, HttpToFileAccess.ql, and RequestForgery.ql.

[esbena]

One nit.
If you worry about the performance, could you perhaps check if the new Range-member actually changes any existing DIL significantly?

[erik-krogh]

If you worry about the performance, could you perhaps check if the new Range-member actually changes any existing DIL significantly?

It doesn't make any significant change in the DIL. It just adds some new predicates and a new case to ClientRequests::ClientRequest::Range#class#ff.