Set character set of selected database columns from utf8 to utf8mb4 to allow saving texts containing emojis

[abhishek-webkul]

Selected fields are:

• Hotel name and description
• Room type name and description
• Service product name and description
• Voucher name and description
• Category name and description
• CMS name and description
• CMS category name and description
• Configuration values
• Feature name
• Group name
• Custom navigation links
• Testimonials
• Hotel Reviews