generate_uuid generates a universally unique identifier (UUID Version
4 and Variant 1).
generate_uuid(seed = NULL)A single integer specifying the seeds.
If NULL (the default) the seed will be re-initialized.
A character string (UUID).
A 36 characters long character string.
As it relies on R's internal random number generators and so will suffer
from the use of set.seed in a session, the seed is
re-initialized during execution (unless seed is not NULL).
To prevent any side effects, the random number generator (RNG) state is
saved and restored when the function exits.