[OpenAPI] Implemented example as per example wiki page for getting anchors based...

[OpenAPI] Implemented example as per example wiki page for getting anchors based on dataspace

-moved components from cpsAdmin.yml to components.yml
-refactored variable for anchor details list in AdminRestController.java
-reintrocuded paramter for anchorsByDataspace
-refactored variables in AdminRestController.java getAnchors() to be
more intuitive
-refactored AdminRestController.java to use modelmapper and removed
extra conversion code. Also modified AdminRestControllerSpec.groovy to
use ModelMapper as Spy rather than a Mock
-added responses for getAnchor & getSchemaSet
-added javadoc for AdminRestController.java public methods
-refactored schemaDetils pararmeter from dataSpasceName to name for
CSOT tests & added some code review comments

Issue-ID: CPS-429

Change-Id: I01d4113313c9a23d9a7e0e96e46b90f9ac767f24
Signed-off-by: JosephKeenan <joseph.keenan@est.tech>