feat: Add event for LTI Launches

[xitij2000]

Description

Adds an LTI launch event with data related to LTI Launches.

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[tecoholic]

@xitij2000 👍

• I tested this: Tested this along with openedx/openedx-platform#36756 and open-craft/platform-plugin-lti-launch-monitor#1 and verified that the events are generated and consumed as expected.
• I read through the code
• I checked for accessibility issues
• Includes documentation

[tecoholic]

@xitij2000 I think it would be useful to expand this and mention it's a comma separated list of roles. It's natural to expect a list for the plural form (roles vs role) here and get confused in the future.

[mariajgrimaldi]

Thank you for the contribution! We really appreciate it. I left two minor comments to address, so we can merge after. Thank you!

[mariajgrimaldi]

Is there a reason why we're duplicating user's the info?

[xitij2000]

The user data here is for the Open edX user, whereas the user in the LtiProviderLaunchParamsData is the remote user id received via LTI.

[mariajgrimaldi]

Oh great. Can we add that detail in the docstring?

[mariajgrimaldi]

Can we add the attrs description as well here?

[xitij2000]

@mariajgrimaldi I've updated the PR as per you suggestion. Do tell me if there are any issues with including the user data.

[mariajgrimaldi]

LGTM!

Thank you so much

[mariajgrimaldi]

https://github.com/openedx/openedx-events/releases/tag/10.3.0