Request for High-Level API Function to Convert CollectionConfig String

### Is your proposal related to a problem?

Currently, defining collections within chaincode requires manually constructing the `peer.CollectionConfigPackage` structure, which can be cumbersome and error-prone. This issue proposes the creation of a high-level API function that simplifies this process by accepting a collection configuration string and automatically converting it into the required format for `ChaincodeDefinition.Collections`.

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### Describe the solution you'd like

Introduce a new function, potentially named `parseCollectionConfig(configString)`, which takes a collection configuration string as input and returns a properly formatted `peer.CollectionConfigPackage` structure. The function should be capable of parsing a variety of string formats, such as JSON, and handle common collection configuration parameters (e.g., name, policy, requiredPeerCount, etc.).

### Describe alternatives you've considered

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### Additional context

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