contrib: added codemeta custom fields.

[alejandromumo]

closes #1186

[ppanero]

Content LGTM! nice job! Questions are more on code placement and responsabilities.

[ppanero]

Can we overwrite config using the app_config fixture?

[alejandromumo]

You mean using the fixture app_config or moving these config's loading to the fixture itself? If the latter, I'd prefer to load them on demand since that's how the end user will load these custom fields. They must be explicitely loaded when they are to be used.

[ppanero]

I meant, on demand. You can overwrite the app_config and then all gets injected automatically, you can also control the scope, etc. e.g.

invenio-rdm-records/tests/conftest.py

Line 214 in d2cede0

def app_config(app_config):

[alejandromumo]

I ended up doing something different, sorry. I was having quite some trouble to make it work with app_config, as it gets picked up by base_app when the app is initialised.
What I am doing now is simply injecting the configs in the app, initialising the codemeta custom fields and rolling the config back afterwards.

I like your idea better, however I ran into multiple issues (some not even related) and this is how I made it work.

[alejandromumo]

Tests are failing but feel free to discuss, namely this comment

[slint]

LGTM! Some naming nits, and a possible fixture removal 🙌

[kpsherva]

LGTM! but as I am not expert on custom fields maybe someone else should take a look

[slint]

Some minor comments on mappings/types, and naming nits (I should start paying more attention in the first reviews 😏 )

[zzacharo]

Needs rebasing and addressing some minor comments :)