2344 support contract call nested option of case some none

[hui-an-yang]

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closes #2344

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Release Note Draft Snippet

In order to support case Some(None) when making contract calls in nested options like type (option (option nat)), we are introducing new semantic { Some: null } to EncodeObject() in @taquito/michelson-encoder.
So user can make contract call with .methodsObjects in contractAPI and walletAPI.
The old semantic still works but will look to deprecate them in the future.
Michelson type: option nat as Michelson Value: Some(1) can be called with 1 or [1] can now also be called with { Some: 1 } with methodObject.
And the corresponding Execute() in @taquito/michelson-encoder will return { Some: '1' } instead of previous 1

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