Make options parameter optional in dotLottieInstance.toArrayBuffer

[theashraf]

Currently, the dotLottieInstance.toArrayBuffer method requires an options object to be passed as an argument. This requirement can be inconvenient for users who do not need to specify any options. It would be beneficial to make the options parameter optional, allowing the method to be called without any arguments.

Current Behavior:
Calling dotLottieInstance.toArrayBuffer() without an argument results in a type error

Expected Behavior:
The dotLottieInstance.toArrayBuffer() method should execute without error when called without the options argument, using default settings internally if no options are provided.