Get the list of providers on an alternative way and improved regexes for getting the url

[idgserpro]

See https://github.com/simplesconsultoria/sc.embedder/blob/262d279b25878d11706eb25c9b94a699789ed4e5/src/sc/embedder/utility.py#L7

The way it's implemented right now for example gives the following error for https links in some providers:

2020-01-13 16:44:19 INFO sc.embedder There are no endpoints available for https://vimeo.com/384531827

Don't know if it's possible, but I would suggest taking https://github.com/itteco/iframely/blob/master/lib/plugins/system/oembed/providers.json inside the package and creating a dictionary that has these validations at runtime: upgrading the providers would mean just downlading a new json and adding it to the package. Using this approach we fix the regex problem as well since they are improved.