PfsGroup type 
Defines values for PfsGroup. 
KnownPfsGroup can be used interchangeably with PfsGroup,
this enum contains the known values that the service supports.
Known values supported by the service
None 
PFS1 
PFS2 
PFS2048 
ECP256 
ECP384 
PFS24 
PFS14 
PFSMM
type PfsGroup = string