Implement a function to save the result in a file instead of displaying it in the notebook

[mznmel]

One suggested way to implement this feature is to add a new function named saveSora which takes the same set of arguments as sora, plus the file path:

from sora import saveSora
saveSora('./image.jpg', x)

the main sora function should be restructured such that both sora and ``saveSora` use internally the same functions, but with different rendering methods.