add a method on GridCoverageWrapper to return the wrapped GridCoverage

Description

The internal GeoServer's customizer readers may wrap a read GridCoverage into a GridCoverageWrapper.
We may need to access to the wrapped object so let's add a method to return it.

Environment

None

Status

Assignee

Daniele Romagnoli

Reporter

Daniele Romagnoli

Triage

None

Fix versions

Affects versions

None

Components

Priority

Medium