refactor notification

[alexskr]

notification refactor follow up to https://github.com/ncbo/ontologies_linked_data/pull/148

• Rename variables and methods to make a clear distinction between OntoPortal site admins, ontology admins and support.
• Add new feature to optionally disable notifications send to OntoPortal admins for each event associated with ontology creation, new user, etc
• LinkedData.setting.support_contact_email is a new configuration option for setting end user support contact email. BioPortal requires different emails for contacting BioPortal site admins and end user support

In order to clarify the distinction between the OntoPortal site admins and ontology owners/admins the following settings and methods are renamed:

LinkedData.setting.admin_emails is renamed to ontoportal_admin_emails LinkedData::Utils::Notifier.admin_mails -> ontology_admin_emails LinkedData::Utils::support_mails -> ontoportal_admin_emails LinkedData::Utils::notify_support_grouped -> notify_ontoportal_admins_grouped

[alexskr]

@syphax-bouazzouni please review the follow up changes and let me know if there is anything that should be tweaked in order to fit your code base

[codecov[bot]]

Codecov Report

Attention: 30 lines in your changes are missing coverage. Please review.

Comparison is base (4b6b7f4) 80.76% compared to head (d0b6ad8) 80.66%. Report is 4 commits behind head on develop.

:exclamation: Current head d0b6ad8 differs from pull request most recent head 87afcc4. Consider uploading reports for the commit 87afcc4 to get more accurate results

Files	Patch %	Lines
lib/ontologies_linked_data/utils/notifications.rb	61.97%	27 Missing :warning:
lib/ontologies_linked_data/utils/notifier.rb	94.82%	3 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #184 +/- ## =========================================== - Coverage 80.76% 80.66% -0.10% =========================================== Files 63 64 +1 Lines 4917 5337 +420 =========================================== + Hits 3971 4305 +334 - Misses 946 1032 +86 ``` | [Flag](https://app.codecov.io/gh/ncbo/ontologies_linked_data/pull/184/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ncbo) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/ncbo/ontologies_linked_data/pull/184/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ncbo) | `80.66% <76.92%> (-0.10%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=ncbo#carryforward-flags-in-the-pull-request-comment) to find out more.

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