API: updateCollectionItem - lib

[Austin2Shih]

• write async updateCollectionItem(collection, id: string, body: obj) within _datalib/collections
• return the following format: {ok: boolean, body: body || null, error: error || null}
• Use try/catch and the custom Errors defined in _utils/response/Errors
• Feel free to create new Error types if you see fit (following error code conventions for HTTP)

[winzamark123]

#85