OpenSpiel game methods: observation_tensor_shape and observation_tensor_size

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1. observation_tensor_shape()

2. observation_tensor_size()

(1) Returns the observation tensor’s shape: a list of integers representing the size of each dimension.

(2) Returns the total number of values used to represent the observation tensor.

Examples:

import pyspiel

game = pyspiel.load_game("tic_tac_toe")
print(game.observation_tensor_shape())
print(game.observation_tensor_size())

# Output:
# [3, 3, 3]
# 27