Buffer property return TEXT instead of buffer

Bug or feature request

• Bug
• Feature request

Description of feature (or steps to reproduce if bug)

Currently, I am using this with loopback4. But the connector does not provide some type support such as, Buffer or Array. They will all turn into TXET in sqlite3. And more importantly, the 'Buffer' seems to work quite well. When i wrote something to a 'Buffer' property, it will ture in to some TEXT like

{ type: 'Buffer',
  data: 
   [ 120,
     156,
     237,
     205,
     59,
]
```.
And I when i retrieve it is still a JSON object instead of a Buffer object which is different than the TypeScript definition in my model property. While Typescript believe it is a buffer,,,,


### Link to sample repo to reproduce issue (if bug)



### Expected result



### Actual result (if bug)



### Additional information (Node.js version, LoopBack version, etc)

The issue names loopback-connector-sqlite3 and SQLite3 but mentions no files, tests, or reproduction repository. Start by locating the connector's type conversion and retrieval paths, then reproduce the Buffer property behavior; done should mean stored Buffer values are retrieved as Buffer objects rather than JSON-shaped TEXT values.