CAD import in parallel for multiple files

Hi,

I am working on multiple jt files for external aero automotive preprocessing. In Automotive application it is a general scenario to import multiple cad files. Importing files in parallel will save lot of time of user.
Currently I am see slowness in jt import.

Rohit

cc : @ninad-kamat @rajesh1359 @schadha78 @waltersma @ansutremel

Start by locating the existing JT import implementation and the entry point used when importing multiple CAD files. Measure the current multi-file behavior and review how imports are coordinated before defining the parallelization scope. Done means multiple JT files import concurrently with correct results and improved elapsed time.

Written by the indexing model from the issue text.