Namespace handling directly with the uuid module

[thomasbtnfr]

Can we improve the use of the uuid module so that it handles namespaces directly instead of manually indicating the namespace urn each time?

Describe the solution you'd like
A complete management of uuids and namespaces by a particular module (maybe uuid)

Describe alternatives you've considered
If we add the urn namespace manually then we will have to declare it somewhere, in the context and in the RDF python library.

Additional context
Context : bids-standard#83 (comment)

[thomasbtnfr]

From a few tests:

• We can't use the uuid directly without the conversion to str otherwise we have the following error : TypeError: Object of type UUID is not JSON serializable when writing the jsonld in output
• Some functions of the uuid module can use a namespace like uuid3 which takes as parameter a namespace and a name
  Example :

uuid.uuid3(uuid.NAMESPACE_DNS, 'python.org')
UUID('6fa459ea-ee8a-3ca4-894e-db77e160355e')

but I'm not sure the output does anything for namespace management

[cmaumet]

see also satra's comment in bids-standard#83 (comment)