[gobinding] add more methods to context interface

[hsinhoyeh]

Hi there,

I am using go binding for whisper and want to add some functions in context interface

+       SetMaxContext(n int)            // Set maximum number of text context tokens to store
+       SetBeamSize(n int)              // Set Beam Size
+       SetEntropyThold(t float32)      // Set Entropy threshold

just wondering what is the best way to keep it in sync or we just update it manually?

[hsinhoyeh]

just fire a PR first, and see if we have better idea (or more functions to add).