feat: allow specifying custom page size for course list api

[navinkarkera]

Description

Adds query param page_size to customize page size of course list api.

Useful information to include:

• Which edX user roles will this change impact? "Developer"

Supporting information

• Related to: feat: course import filter in library and fix list order frontend-app-authoring#2773
• Private-ref: https://tasks.opencraft.com/browse/FAL-4308

Testing instructions

See openedx/frontend-app-authoring#2773

Deadline

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[rpenido]

LGTM 👍
Thank you for your work, @navinkarkera!

• I tested this using the instructions from openedx/frontend-app-authoring#2773
• I read through the code
• I checked for accessibility issues
• Includes documentation

[ChrisChV]

Looks good! 👍