enhance UUID@GEN to generate ITU compatible uuids

UUID@GEN data set is a member of hlq.SEZALOAD.
(alias of member ezauidgn)

currently
TSO UUID@GEN or
TSO ezauidgn
generate for example
uuid (458487b55160.02.c0.64.02.03.00.00.00)
containing
time_high := 458487b5
time_low := 5160
family := 02
host := c0640203000000

This is the old fashioned NCS form.
IBM z/OS DCE offered the modern ITU form, but was withdrawn. Now there is no valid uuid generator in z/OS.

Please enhance UUID@GEN in order to gerate ITU-compatible uuids http://www.itu.int/ITU-T/asn1/uuid.html
The UUID is a 36-character string that consists of numeric and hexadecimal characters. This string must have the
delimiter character (-) in positions 9, 14, 19, and 24. The general format for the UUID string is
xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx, in which x represents a valid numeric or hexadecimal character.

UUID shall be represented in binary as 16 octets formed by the concatenation of the unsigned integer fixedlength
encoding of each of its fields into one or more octets. The number of octets to be used for each field shall be:
a) the "TimeLow" field: four octets;
b) the "TimeMid" field: two octets;
c) the "VersionAndTimeHigh" field: two octets;
d) the "VariantAndClockSeqHigh" field: one octet;
e) the "ClockSeqLow" field: one octet;
f) the "Node" field: six octe

example
550e8400-e29b-11d4-a716-446655440000
#time_low = 550e8400
#time_mid = e29b
#time_high = 11d4
#clock_seq = a716
#node := 446655440000