feat(icons): add Academy icon

[Rajesh-Nagarajan-11]

This PR adds the Academy icon to the Sistent project’s icon collection.

Notes for Reviewers

• Please review the Academy icon’s design
• The icon can be customized by changing the colors of the top, center, and bottom sections.
  • topFill
  • centerFill
  • bottomFill
• Example : <AcademyIcon topFill={theme?.palette?.background?.inverse || "#eee"}/>;

Default Icon :

Signed commits

• Yes, I signed my commits.

[ChetanFTW]

hey @Rajesh-Nagarajan-11 "Academy" LGTM, can you also check for "AddCircle"

[Rajesh-Nagarajan-11]

@ChetanFTW Next to this PR can check ✅