Schema Pro 2.8.1

# Improvement: Course schema - Updated course workload to ISO format.
# Improvement: Product Schema - Added new fields hasMerchantReturnPolicy and shippingDetails under offers in merchant listings.
# Improvement: Review Schema - Updated fields hasCourseInstance and offers when item type is course.
# Fix: Review Schema - Throwing error related to shortcode returns the word 'array'.

# Improvement: Compatibility with WordPress version 6.5.
# Improvement: Updated Course schema as per Google's new guidelines.
# Improvement: Updated Video object schema according to Google's latest guidelines.
# Fix: Conflict with Avada plugin while saving the page.
# Fix: PHP Warnings and deprecated errors.
# Fix: Resolved implode function error.
# Fix: Resolved Recipe schema timezone warning.
# Fix: Resolved unparsable structured data issue.

# Improvement: Improved codebase for improved security.
# Improvement: PHP 8.2 compatibility testing and fixes.
# Improvement: Updated placeholder URL from HTTP to HTTPS.
# Fix: Resolved conflicts with Avada builder plugin.
# Fix: Resolved fatal error caused by identical function name conflicts with other plugins.
# Fix: Undefined wpcom_vip_url_to_postid causing fatal error.