Optimize IBC relayer algorithm implementation for better efficiency a…

…nd readability - Improve relay function with proper control flow and early exit via continue - Add destructuring and conditional checks to avoid unnecessary work - Fix pendingDatagrams function with: - Add proper variable declarations with const - Improve readability with structured formatting - Add null/undefined checks using modern syntax - Fix potential reference errors - Improve object construction syntax - Remove redundant operations and simplify code flow - Add descriptive comments for better maintainability