docs: create a Querying Data page for LoopBack 4

[achrinza]

Currently, if a user of LoopBack 4 (lb4) wants to find documentation of the usable filters for querying the repository, they will need to view LoopBack 3's (lb3) documentation. This may not be ideal as the page isn't easily accessible via the lb4 sidebar.

Suggestion

Create a Querying Data or Filters page for lb4, replacing content and links to point to the lb4 docs where appropriate.

Use Cases

1. Reduce jump between documentations
2. Assurance that this documentation also applies lb4
3. Easier for new users to start using lb4

Examples

TBD; It could closely follow the existing lb3 docs.

Acceptance criteria

TBD - will be filled by the team.

[dhmlau]

@achrinza, thanks for suggesting this addition to the docs. I think this is much needed as well. We have an open issue: #2527. So I'd like to close this issue as duplicate and continue the discussion over there. Thanks!