[BP MB-38169] - Views do not handle compressed raw documents

Steps to Reproduce

1. Create a cluster with a single data node.
2. Create a bucket (mine named test), set compression to 'Active'.
3. Add a binary document to the bucket:

   /opt/couchbase/bin/cbc create -U "couchbase://localhost/test" -u Administrator -P password testing1234 -V $(printf '=%.0s' {1..100000})

4. Create a view with the default definition (emit(meta.id, null)).
5. Run the view across the full dataset.

Expected Result
The results of the view to come back, not sure if the doc should be included or not, but it should succeed.

Actual Result
The view query fails with the following error:

reason: case_clause (2) 

Analysis
This is the same as MB-32858, but there's a different datatype not being handled.
Views need to handle DCP_DATA_TYPE_RAW_COMPRESSED (http://src.couchbase.org/source/xref/6.0.3/couchdb/src/couch_dcp/include/couch_dcp.hrl#56) in do_maps() (http://src.couchbase.org/source/xref/6.0.3/couchdb/src/couch_set_view/src/couch_set_view_updater.erl#844-865).

Workaround
The workaround for this issue is the same as MB-32858, add the following to the view definition:

var x = doc;