Feature: more robust dart codegen

[joshmossas]

Generated dart models now have the following features

• overrides == operator and hashCode to enable deep equality checking. Ex: MyObject == MyOtherObject will check against all the properties in both objects
• override toString() to show each of the object propeties rather than Instance of MyObject
• add toJsonString() method
• add fromJsonString() factory method

Other Changes (All Languages)

• remove onConnectionError from sse stuff. Connection errors now trigger onError. pushError now removed from sse server library stuff

[nx-cloud]

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• nx affected -t pub -- get
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