feat: database item base class and unit tests

[BryanPan342]

Features

• Created a base class to place and fetch data from OCI. Any class that corresponds to an entry into the database should follow the following composition.

  export interface IUser extends IDbItem {
  ...
  }
  
  export class User extends DbItem {
  
  constructor(id: string, props: UserProps) {
    // the class itself should assign which collection an item lives in!
    super(id, 'users');
    ...
  }
  }

• helper function to get documents from the DbClient

Testing

• Figured out how to mock oracledb through jest
• Put environment variables for testing
• Some prelim tests for DbClient

BREAKING CHANGES When running client.openCollection(name), if the NODE_ENV is not PROD, we will now target the collection with name test_${name}.

We should probably write a script to delete the contents of this table periodically too.. as well as create a backup for our current tables...

[mergify[bot]]

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