online: CA updates

• the online tracking chain config is renamed from "CaConfig.yaml" to "TrackingChainConfig.yaml" w- the ca.par update (accounting for a material gap between STS and TOF)
• the main and user configuration for CA tracking in online tracking chain is added
• the ca.par is now used only for geometry representation, the tracking parameters are updated from the configs
• the number of threads is removed from the online tracking chain config