feat: Support new multipliers (#366)

closes #363

Supported quetta (Q), ronna (R), ronto (r) and quecto (q) prefixes for
the SI units.

Author: hpohekar

src/ansys/units/cfg.yaml

@@ -11,6 +11,8 @@
 # For micro, u is used instead of the Greek letter mu.
 
 multipliers:
+  Q: 1.0e+30
+  R: 1.0e+27
   Y: 1.0e+24
   Z: 1.0e+21
   E: 1.0e+18
@@ -31,6 +33,8 @@ multipliers:
   a: 1.0e-18
   z: 1.0e-21
   y: 1.0e-24
+  r: 1.0e-27
+  q: 1.0e-30
 
 # Unit Systems
 # ------------