Refactor _evaluate_omaha_cards and simplify it

[ParthShitole]

The _evaluate_omaha_cards is refactored and four new methods are added to simplify the orignal function:

def _count_suits

• This function counts the occurrences of each suit in the given list of cards (both community and hole cards).
  It returns a list of counts indexed by suit.

def _determine_flush_suit

• This function determines if a flush is possible based on the counts of suits in both community and hole cards.
  It returns the flush suit index or -1 if no flush is possible.

def calculate_flush_value

• This function calculates the value associated with the flush based on the flush suit, community cards, and hole cards.

def calculate_non_flush_value

• This function computes the value of the hand when no flush is present.
  Additionally magic numbers are replaced with named constants.

Closes #92

[HenryRLee]

Looks good to me. Thanks for your contribution!

[ParthShitole]

Can you Merge this PR