fix: nullable array/map handling

[alex-vasylchenko]

• Updated arrayToJson() to safely handle null values returned by getString(), getMap(), and getArray(). Now explicitly inserts JSONObject.NULL when null values are encountered, preventing potential crashes or incorrect JSON.

• Updated mapToJson() with similar null checks for strings, nested maps, and arrays to ensure JSONObject.NULL is used where appropriate.

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[stephenmcd]

Thank you

[litinskii]

@stephenmcd Is it possible to find out when these changes will be published on npm?

[stephenmcd]

Hey there, I'm currently working on upgrading everything to work with both of RN's new and old architectures, which requires full typescript support as well. I can't give an exact ETA but it's very soon.