Extended server functionality by implementing FAILOVER command (#875)

* Added arrayable arguments classes

* Updated count trait to accept additional modifier argument

* Added new With traits, moved into separate directory

* Added traits for geo command arguments resolving

* Remove BaseWith trait, not working with traits nesting

* Added AscDesc trait

* Rename AscDesc traint into Sorting

* Fixed trait keyword

* Removed unnecessary traits

* Updated count trait to handle default argument value

* Fixed With traits offset check condition

* Added GeoFrom, GeoBy traits

* Fixes for Count and Sorting traits

* Fixed variable names in with traits

* [WIP] Added GEOSEARCH command support, without test coverage

* Changed functionality to support only lower case units (Redis 6.0 support)

* Changed namespace for WITHSCORES trait

* Added more test coverage, added response parsing

* Added test coverage for tratis

* Added support for FAILOVER command

Co-authored-by: Vladyslav Vildanov <vladyslavvildanov@Vladyslav-Vildanov-MacBook-Pro.local>

src/ClientContextInterface.php

@@ -13,6 +13,7 @@ namespace Predis;
 
 use Predis\Command\Argument\Geospatial\ByInterface;
 use Predis\Command\Argument\Geospatial\FromInterface;
+use Predis\Command\Argument\Server\To;
 use Predis\Command\CommandInterface;
 
 /**
@@ -48,6 +49,7 @@ use Predis\Command\CommandInterface;
  * @method $this bzmpop(int $timeout, array $keys, string $modifier = 'min', int $count = 1)
  * @method $this decr($key)
  * @method $this decrby($key, $decrement)
+ * @method $this failover(?To $to = null, bool $abort = false, int $timeout = -1)
  * @method $this get($key)
  * @method $this getbit($key, $offset)
  * @method $this getex(string $key, $modifier = '', $value = false)