feat(eslint-plugin): add rule require-lifecycle-on-prototype #2259
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Fixes #1002
This rule ensures that lifecycle methods are defined against the object's prototype instead of the object's instance.
Rather than limiting this rule to only check within component, directive, pipe and service (injectable) classes, the rule checks assignments everywhere. I think this is better because it will also catch cases where helper functions are used to incorrectly add lifecycle methods. For example, it will catch the problem with this code: