Material map for EPIC

First version of material map for the tracking volume of EPIC detector in LBL design. No AC-LGAD yet. Material surfaces from Geantino scan: Geantino vs. material map comparison:

The outer supporting cylinder is projected to the last disk which is not ideal. Need to improve later.

PR on github/epic: https://github.com/eic/epic/pull/96

Material map file: material-maps.cbor