Improve Error Logging for Font Imports (oblador#1475)

Improve error logging for failed font imports by including the missing fonts name in the error message. Current exception message is not detailed enough to help developers troubleshoot which exact font is failing without jumping from debugging JS --> Objective C code.

RNVectorIconsManager/RNVectorIconsManager.m

@@ -154,7 +154,8 @@ - (NSString *)createGlyphImagePathForFont:(NSString *)fontName
       if (error.code == kCTFontManagerErrorAlreadyRegistered || error.code == kCTFontManagerErrorDuplicatedName) {
         resolve(nil);
       } else {
-        reject(@"font_load_failed", @"Font failed to load", error);
+        NSString *errorMessage = [NSString stringWithFormat:@"Font '%@' failed to load", fontFileName];
+        reject(@"font_load_failed", errorMessage, error);
       }
     } else {
       resolve(nil);