feat: add new signal to indicate new course import

[navinkarkera]

Description

Adds COURSE_IMPORT_COMPLETED signal that is triggered once a course import is completed.

Supporting information

• Related PR: feat: upstream-downstream entity linking [FC-0076] openedx-platform#36111

Testing instructions

See openedx/openedx-platform#36111

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• Upgrade the package in the Open edX platform requirements (if applicable)

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[pomegranited]

👍

• I tested this as part of testing openedx/openedx-platform#36111
• I read through the code
• I checked for accessibility issues N/A
• Includes documentation
• User-facing strings are extracted for translation N/A

[ChrisChV]

Looks good 👍

[mariajgrimaldi]

@navinkarkera: thanks for addressing the comments on the PR!

LGTM! Please merge and release the new lib version when you see fit :)