unit/gatt: Add TP/GAR/CL/BV-04-C test
unit/gatt: Add TP/GAR/CL/BV-04-C test

Verify that a Generic Attribute Profile client can read a Characteristic
Value by selected handle. The Characteristic Value length is unknown to
the client and might be long.

silent-snowman/bluez,pstglia/external-bluetooth-bluez,pkarasev3/bluez,ComputeCycles/bluez,mapfau/bluez,mapfau/bluez,pstglia/external-bluetooth-bluez,pkarasev3/bluez,pstglia/external-bluetooth-bluez,ComputeCycles/bluez,silent-snowman/bluez,pkarasev3/bluez,pstglia/external-bluetooth-bluez,mapfau/bluez,mapfau/bluez,ComputeCycles/bluez,silent-snowman/bluez,pkarasev3/bluez,silent-snowman/bluez,ComputeCycles/bluez