Create aliases to rework PV names

The PV names in the SIM IOC do not follow the convention of having suffixes -R -RB and -S meaning "Read value", "Readback value", "Setpoint", respectively. Also, A lot of PV are all in uppercase, like $(PREFIX)$(SGNL):IMAXSOL-RB, where the correct would be $(PREFIX)$(SGNL):MaxCurSol-RB, or something similar.

As a lot of these systems are already in operation, changing the PV names would have a significant impact, as we would have to update OPIs and Archiver files accordingly. A better solution is to have an intermediate version with the new PV names coexisting with the current ones as aliases. Then, in a future maintenance window (likely after the DTL commissioning), we can deprecate the current PV names and replace with the aliases.

See discussion on !11 (comment 60865)