Allow required params for token creation

[avdata99]

If the expire_api_token plugin is enabled we need to define expires_in and unit parameters

The environment variables DATAPUSHER_TOKEN_EXPIRES_IN and DATAPUSHER_TOKEN_EXPIRES_UNIT are proposed to fix a build error

 Traceback (most recent call last):
ckan-dev4      |   File "/usr/bin/ckan", line 8, in 
ckan-dev4      |     sys.exit(ckan())
ckan-dev4      |   File "/usr/lib/python3.10/site-packages/click/core.py", line 1130, in __call__
ckan-dev4      |     return self.main(*args, **kwargs)
ckan-dev4      |   File "/usr/lib/python3.10/site-packages/click/core.py", line 1055, in main
ckan-dev4      |     rv = self.invoke(ctx)
ckan-dev4      |   File "/usr/lib/python3.10/site-packages/click/core.py", line 1657, in invoke
ckan-dev4      |     return _process_result(sub_ctx.command.invoke(sub_ctx))
ckan-dev4      |   File "/usr/lib/python3.10/site-packages/click/core.py", line 1657, in invoke
ckan-dev4      |     return _process_result(sub_ctx.command.invoke(sub_ctx))
ckan-dev4      |   File "/usr/lib/python3.10/site-packages/click/core.py", line 1657, in invoke
ckan-dev4      |     return _process_result(sub_ctx.command.invoke(sub_ctx))
ckan-dev4      |   File "/usr/lib/python3.10/site-packages/click/core.py", line 1404, in invoke
ckan-dev4      |     return ctx.invoke(self.callback, **ctx.params)
ckan-dev4      |   File "/usr/lib/python3.10/site-packages/click/core.py", line 760, in invoke
ckan-dev4      |     return __callback(*args, **kwargs)
ckan-dev4      |   File "/srv/app/src/ckan/ckan/cli/user.py", line 200, in add_token
ckan-dev4      |     token = logic.get_action(u"api_token_create")(
ckan-dev4      |   File "/srv/app/src/ckan/ckan/logic/__init__.py", line 551, in wrapped
ckan-dev4      |     result = _action(context, data_dict, **kw)
ckan-dev4      |   File "/srv/app/src/ckan/ckan/logic/action/create.py", line 1524, in api_token_create
ckan-dev4      |     raise ValidationError(errors)
ckan-dev4      | ckan.logic.ValidationError: None - {'expires_in': ['Missing value'], 'unit': ['Missing value']}
postgresql4    | 2023-06-27 18:21:02.796 UTC [65] LOG:  unexpected EOF on client connection with an open transaction
ckan-dev4      | /srv/app/start_ckan_development.sh: Running init file /docker-entrypoint.d/01_lower_ckan_log_level.sh