Advanced body mass index ( BMI ) calculator flutter package

Added: #

• BMI Calculation: Implemented BMI calculation using weight and height.
• BMR Calculation: Added Basal Metabolic Rate (BMR) calculation using the Harris-Benedict equation.
• Calorie Suggestions: Suggested daily calorie intake based on activity level (sedentary, lightly active, etc.).
• Age Category Determination: Introduced age categories (child, adult, elderly) to adjust BMI status and calculations.
• AdvancedBmiModel: Integrated BMI, BMR, status, age category, and calorie suggestions into the AdvancedBmiModel.

Changed: #

• Controller Logic: Refined BMI and BMR calculation logic and structured the response.
• Error Handling: Added validation for invalid inputs (e.g., negative weight, zero height, or invalid gender).

Fixed: #

• Edge Case Handling: Improved handling for extreme values (e.g., zero height or negative weight).
• Invalid Gender Handling: Added checks for invalid gender inputs other than 'male' or 'female'.

Removed: #

• No removals in this version.

Fix some problems