[Feature Request] REST API handler add sparse fields

[sw34]

Is your feature request related to a problem? Please describe.
The current implementation of the REST API does not include the ability to specify "sparse fields" to limit the fields return as attributes. This is documented in the specification here: https://jsonapi.org/format/#fetching-sparse-fieldsets

Describe the solution you'd like
Implement as described in the specification

Describe alternatives you've considered
none

Additional context
I have submitted a pull request to implement this as #2252

[ymc9]

Fixed in 2.19.2