utils: add utility method for vectors and arrays

This patch adds a new utility method to convert C++ data containers to
Objective-C ones.
Here, std::vector of std::map containers are translated to NSArray of
NSDictionary.

Issue: #1391
Change-Id: I61f7a57d2801949eac5685ffb0d734f26eeab87c
Reviewed-by: Silbino Gonçalves Matado <silbino.gmatado@savoirfairelinux.com>

Ring/Ring/Bridging/Utils.h

@@ -31,5 +31,6 @@
 + (NSMutableDictionary*)mapToDictionnary:
     (const std::map<std::string, std::string>&)map;
 + (std::map<std::string, std::string>)dictionnaryToMap:(NSDictionary*)dict;
++ (NSArray*)vectorOfMapsToArray:(const std::vector<std::map<std::string, std::string>>&)vectorOfMaps;
 
 @end

Ring/Ring/Bridging/Utils.mm

@@ -56,4 +56,17 @@
   return resMap;
 }
 
++ (NSArray*)vectorOfMapsToArray:
+(const std::vector<std::map<std::string, std::string>>&)vectorOfMaps {
+    NSMutableArray* array = [[NSMutableArray alloc] initWithCapacity:vectorOfMaps.size()];
+
+    std::for_each(
+                  vectorOfMaps.begin(), vectorOfMaps.end(), ^(std::map<std::string, std::string> map) {
+                      NSDictionary *dictionary = [Utils mapToDictionnary:map];
+                      [array addObject:dictionary];
+                  });
+
+    return [NSArray arrayWithArray:array];
+}
+
 @end