[feat] max() implementation

[ayaankhan98]

implement the following function for largeInt class

• max(a, b) returns the maximum of a and b max() can have overloads example

  max(largeInt, largeInt);
  max(largeInt, int);
  max(largeInt, int64_t);

  there are more possibile overloads but for now aim is to implement these trivial overloads

[mangodo100]

Please assign this to me