Allow webservices external apps to show configuration options based on functions it contains

[Robert Lyon]

Currently the LTI module has the ability to configure the following 2 options:
- autocreateusers
- parentauth

And they are used in the module_lti_launch function.

But if we make a custom webservice and include module_lti_launch as one of it's services we have no way (apart from directly on database) to set these options

Currently the webservice/admin/oauthv1sregister.php page shows the config cog if a module has
has_oauth_service_config() set to true and displays the config form via get_oauth_service_config_options()

But what we should have is some code that checks if the webservice contains functions that have config options and then display the button / form

[Mahara Bot (dev-mahara)]

Patch for "master" branch: https://reviews.mahara.org/11157

[Mahara Bot (dev-mahara)]

Reviewed: https://reviews.mahara.org/11157
Committed: https://git.mahara.org/mahara/mahara/commit/bcdebe61933dcb3d6bece59f6c433961db594400
Submitter: Cecilia Vela Gurovic (<email address hidden>)
Branch: master

commit bcdebe61933dcb3d6bece59f6c433961db594400
Author: Robert Lyon <email address hidden>
Date: Wed Aug 19 12:07:22 2020 +1200

Bug 1892106: Adding hasconfig value to external_functions table

So that functions can alert if they have special config

And check for the service functions that have special config

Change-Id: Ic2bc5ddc1e39f403d1b2583f6d18ec99919d3ffa
Signed-off-by: Robert Lyon <email address hidden>