Tutorials: Refector code in all current tutorials

[RutvikGhaskataEalf]

• Remove any types from all the tutorials

• todo

• nft

• tictactoe

• expense tracker

• single pool staking

• allowance

• dice game

[RutvikGhaskataEalf]

aelf-samples : AElfProject/aelf-samples#11
aelf-docs : #360