* Moving plugins infrastructure to edx-django-utils
This PR extracts the code that enables plugins in edx-platform and puts it in edx-django-utils. This is done to allow other IDAS to add plugin functionality.

* using new welcome template when redirected from enterprise proxy login view

* enabling safe redirects to enterprise learner portal from login in devstack

* ading admin portal to login redirect whitelist

* running make upgrade to version bump edx-enterprise

The CodeOwnerMetricMiddleware is being moved from
edx-platform to edx-django-utils so it can be used
in multiple IDAs.

ARCHBOM-1356

The default for ENABLE_FORUM_DAILY_DIGEST continues
to be True, but this moves the default from
common.py to code.

* Enforce limit on number of blocks allowed in library (blockstore)

* Enforce limit on number of blocks allowed in library (modulestore)

* Changes from review feedback

Used django-ratelimit instead of django-ratelimit-backend
to configure two different rate limit configurations for same
endpoint.

PROD-1708

Ratelimited `login_user` endpoint using `django-ratelimit`, also
decreased default value of logistration rate limit to 100 requests
per five minutes per IP.

PROD-1877

Temporarily increase default throttle rates for service user to handle increased throughput against data sharing consent endpoint

* conservative move to process_request
* added temp_view_func_compare metric to be extra conservative

ARCHBOM-1263

PROD-1506

* Add VEMPipelineIntegration config model
* Add course waffle flag to enable vem pipeline selectively

PROD-1636

Introduces the learning_sequences app, intended to provide metadata for
sequences and course outlines. The short term goal is to provide faster
source of this information for the new Courseware microfrontend
(frontend-app-learning). The medium term goal is to provide an in-proc
API that is useful to other parts of the platform that need fast access
to course outline information customized for a user. The long term
goals are outlined in the README.rst.

This first iteration of the API only lays out the basic structure for
how we'd arrange the pieces, with enough of an implementation to feel
"real" (simple schedules, staff_only content hiding). It's not ready to
be turned on, and is not currently plugged into the publish-flow. The
only way to get data into this new API is via the update_course_outline
management command. The REST endpoint is also currently limited to
global staff only, though it's possible to get the outline for a student
by using the ?username= query parameter.

TNL-7122

* includes ADR for Monitoring by Code Owner
* add monitoring middleware to add the following custom metrics:
- code_owner: The owning team mapped to the current view.
- code_owner_mapping_error: If there are any errors when trying to
        perform the mapping.
- view_func_module: The __module__ of the view_func, which can
        be used to find missing mappings.
* add script to generate `settings.CODE_OWNER_MAPPINGS` from
     a csv file.

ARCHBOM-1244

importing ENTERPRISE_CUSTOMERS_EXCLUDED_FROM_CATALOG list from settings following same pattern that is used for CORS_ORIGIN_WHITELIST

Add list of states and field to UserProfile model; add migration; add
state field to relevant serializers and to
ACCOUNT_VISIBILITY_CONFIGURATION. Removes state data if country is
changed to something other than United States.

The "imp" module is deprecated and should be replaced by "importlib". As
a consequence, loading the django settings used to raise deprecation
warnings:

    DeprecationWarning: the imp module is deprecated in favour of
    importlib; see the module's documentation for alternative uses

It should be noted that python 3.5.1 ships with an older release of
distutils which still relies on the imp module. Thus, users of python
3.5.1 (for instance: edx.org developers) will continue to see the
deprecation warning for some time, despite this patch. We suggest
upgrading to python 3.5.9.

This addresses part of CRI-196.

Created sorting for email field

updated tests

Fixed sorting issue in registration form

Fixed sorting issue in registration form

Fixed sorting issue in registration form

Added missing items in env and updated order logic

Added missing items in env and updated order logic

Th micro-frontend was renamed.

MST-173

to avoid conflicts with settings in Django>2.2

There was an issue where external LMS system (e.g. Canvas, Blackboard) that used Open edX LTI Provider calls had cookies blocked. This update fixes this issue by defining third-party cookies to have attributes of `Secure=True` and `SameSite=None`.

Details here: https://discuss.openedx.org/t/lti-xblock-and-samesite/759/5

(cherry picked from commit 28479a2966b87b16a25dbc96c19b6f5817d255de)

and settings to set SameSite=None for all secure cookies.

PROD-1418

1. Created a new celery queue with key `SOFTWARE_SECURE_VERIFICATION_ROUTING_KEY`.
2. Added a celery task with retry logic.
3. sorted imports with isort.
4. Changed deprecated `log.warn` => `log.warning`.

- create templates and methods to build/send calendar sync emails.