Configure Existing AWS Resources like the JS SDK

[pcanas]

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Language and Async Model

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Amplify Categories

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Gradle script dependencies

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Environment information

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Please include any relevant guides or documentation you're referencing

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Describe the feature request

The current system to use existing AWS resources is very suboptimal, because the amplifyconfiguration.json file gets overwritten any time we pull or push local changes to the cloud.

I propose to adapt this to be similar to the JS SDK where manual configurations can be done in the app without touching the configuration file.

Initialization steps (if applicable)

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Code Snippet

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amplifyconfiguration.json

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GraphQL Schema

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Additional information and screenshots

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