Add ability to provide SQLCipher license key

[wmathurin]

Needed in order to use commercial or enterprise editions of SQLCipher.

Testing

• Put the SQLCipher.xcframework (and openssl.xcframework) for SQLCipher commercial or enterprise edition in the SmartStore project
• Change libs/SmartStore/SmartStoreTestApp/AppDelegate.m b/libs/SmartStore/SmartStoreTestApp/AppDelegate.m

#import "AppDelegate.h"
**#import <SmartStore/SmartStore.h>**

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.
    [SFSmartStore setLicenseKey:@"--YOUR-SQLCIPHER-LICENSE-KEY--"];
    return YES;
}

Expected Result

Only the testSQLCipherVersion should fail, it will report the SQLCipher edition you are using instead of community e.g.

SFSmartStoreTests.m:115: ((version) equal to (@"4.6.1 community")) failed: ("4.6.1 FIPS zetetic") is not equal to ("4.6.1 community")