CBL-5396: Use os_log instead of NSLog for Console Log

Objective-C/CBLConsoleLogger.m

@@ -45,7 +45,8 @@ - (void) logWithLevel: (CBLLogLevel)level domain: (CBLLogDomain)domain message:
 
     NSString* levelName = CBLLog_GetLevelName(level);
     NSString* domainName = CBLLog_GetDomainName(domain);
-    NSLog(@"CouchbaseLite %@ %@: %@", domainName, levelName, message);
+    os_log_t log = os_log_create("CouchbaseLite", "OSDebug");
+    os_log(log, "CouchbaseLite %@ %@: %@", domainName, levelName, message);
 }
 
 @end

Objective-C/CBLDatabase.mm

@@ -115,7 +115,8 @@ to be done in CBLInit()which is called only once when the first CBLDatabase is c
  */
 + (void) initialize {
     if (self == [CBLDatabase class]) {
-        NSLog(@"%@", [CBLVersion userAgent]);
+        os_log_t log = os_log_create("CouchbaseLite", "OSLogging");
+        os_log(log, "%@", [CBLVersion userAgent]);
         // Initialize logging
         CBLAssertNotNil(CBLLog.sharedInstance);
     }

Objective-C/CBLLog.h

@@ -18,6 +18,7 @@
 //
 
 #import <Foundation/Foundation.h>
+#import <os/log.h>
 
 @protocol CBLLogger;
 @class CBLConsoleLogger;

Objective-C/CBLLog.mm

@@ -155,11 +155,12 @@ - (instancetype) initWithDefault {
 #ifdef DEBUG
         // Check if user overrides the default callback log level:
         NSString* userLogLevel = [NSUserDefaults.standardUserDefaults objectForKey: @"CBLLogLevel"];
+        os_log_t log = os_log_create("CouchbaseLite", "OSLogging");
         if (userLogLevel) {
             callbackLogLevel = string2level(userLogLevel);
         }
         if (callbackLogLevel != kC4LogWarning) {
-            NSLog(@"CouchbaseLite minimum log level is %s", kLevelNames[callbackLogLevel]);
+            os_log(log, "CouchbaseLite minimum log level is %s", kLevelNames[callbackLogLevel]);
         }
 #endif
 
@@ -190,7 +191,7 @@ - (instancetype) initWithDefault {
                 C4LogDomain domain = c4log_getDomain(domainName, true);
                 C4LogLevel level = string2level(defaults[key]);
                 c4log_setLevel(domain, level);
-                NSLog(@"CouchbaseLite logging to %s domain at level %s", domainName, kLevelNames[level]);
+                os_log(log, "CouchbaseLite logging to %s domain at level %s", domainName, kLevelNames[level]);
             }
         }
 #endif

Objective-C/Tests/Util/CBLWordEmbeddingModel.m

@@ -40,7 +40,8 @@ - (CBLDictionary*) predict: (CBLDictionary*)input {
     NSString* inputWord = [input stringForKey: @"word"];
 
     if (!inputWord) {
-        NSLog(@"No word input !!!");
+        os_log_t log = os_log_create("CouchbaseLite", "OSLogging");
+        os_log(log, "No word input !!!");
         return nil;
     }