Update response format of get all rapps endpoint

Use ConcurrentMapCacheManager as default cachemanager.
Update getrApps endpoint to list array of rapps.

Issue-ID: NONRTRIC-900
Signed-off-by: aravind.est <aravindhan.a@est.tech>
Change-Id: I82b0be013322abbd835d9313d539919bc954fdf3
4 files changed