Create to_json

[EntilZha]

Implement to_json

This should give the option to write values as an array at the json root, or if the sequence is a list of (Key, Value) pairs to write it as a dictionary at the json root.

Child of #19

[EntilZha]

Going to modify how this works and remove the automatic detection of (Key, Value) pairs in favor of an explicit option. Automatic detection would make it not possible to have a root array written of (Key, Value) pairs without degenerating to an explicit option.

Therefor, type signature will be to_json(path, root_array=True) where if root_array is True, the root will be an array, otherwise it will convert a sequence of (Key, Value) pairs to the root dictionary