feat: add mfe_api v1

This PR adds MFE API. This is part of the work that is being done to obtain the MFE Runtime Configurations and that has been discussed in the BTR WG.

Discussion: https://discuss.openedx.org/t/how-to-use-microfrontend-in-a-multitenant-instance/6936/14?u=mafermazu
MFE Runtime configuration - eduNEXT: https://docs.google.com/document/d/1-FHIQmyeQZu3311x8eYUNMru4JX7Yb3UlqjmJxvM8do/edit?usp=sharing

feat: add lms setting to set mfe config cache (#262)

Co-authored-by: María Fernanda Magallanes Z <maria.magallanes@edunext.co>

feat: make mfe config api disabled by default (#263)

* feat: make mfe config api disabled by default

* fix: simple is better than complex

test: add mfe config tests (#264)

* test: add mfe config tests

* test: fix it and simplify it

* test: correct pylint issues

fix: correct pep 8 violations

fix: add mfe api unit test in github workflow

fix: correct unit tests

refactor: move mfe api to lms

fix: try mfe api urls without regex

fix: add app_namespace in lms urls

fix: try url without conditional

Revert "fix: try url without conditional"

This reverts commit 694aab546134b4bd9ad2642e24927b42cac24459.

fix: set enable_mfe_config_api feature to true in the tests

test: try to add failed test case

Revert "test: try to add failed test case"

This reverts commit cee6bf656ab1b96492b0b6199ddff32a6d6a65bd.

docs: improve explanation and documentation

fix: ensure the response is a json object

refactor: be consistent with the variable names

fix: allow overriding mfe api config cache timeout in production

fix: handle 404 response in view

refactor: use a guard instead if-else

feat: add the possibility to show mfe specific config

.github/workflows/unit-test-shards.json

@@ -71,6 +71,7 @@
       "lms/djangoapps/tests/",
       "lms/djangoapps/user_tours/",
       "lms/djangoapps/verify_student/",
+      "lms/djangoapps/mfe_api/",
       "lms/envs/",
       "lms/lib/",
       "lms/tests.py"