Add comparison to BIP-118 in BIP-448

The email emphasizes the implementation of rebinding signatures by APO through the use of CSFS and TEMPLATEHASH opcodes, which is highlighted as a notable yet cost-effective application. However, it also points out that APO does not support other potential uses of these opcodes. For instance, it lacks functionality in reducing interactivity in protocols reliant on musig, such as ark, and does not support delegation or Discreet Log Contracts (DLCs). The discussion extends to the future possibilities these opcodes might offer as flexible building blocks for various applications, especially after anticipated softforks. This suggests that while the current implementation is beneficial, there remains a significant scope for broadening the utility of these opcodes in blockchain technology developments.