Make PaymentModule UUPSUpgradeable compatible

[gabrielstoica]

Breaking changes

• PaymentModule was refactored to support UUPS upgradeability based on the OpenZeppelin UUPSUpgradeable implementation with ERC-7201;
• Streams are now non-transferable by default due to the new architecture;
• _withdrawMaxAndTransferStream method has been removed;

Other changes

• cancelStream public method has been added on the StreamManager implementation;
• Tests updated accordingly;
• Documentation extended and refined;

[V1d0r]

Good call. UUPSUpgradeable gives the flexibility to enhance and change the PaymentModule later as the product evolves. Particularly around payments streams. transferability and NFTs that are still unexplored fully!