docs(rive-angular): add ng-rive issues analysis report

Comprehensive analysis of all 31 issues (12 open + 19 closed) from the
ng-rive library to document how @grandgular/rive-angular prevents these
common pain points through modern architecture and proper resource management.

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: andrei-shpileuski