[SVS] Add Tiered SVS index implementation

* Vectors moved to backend in 1 background job as a bulk
* Add basic unit tests for SVS tiered index
* Add Python binding for SVS Tiered index
* Backend index synchronized for deleted vectors

Author: rfsaliev

src/VecSim/algorithms/svs/svs.h

@@ -19,6 +19,7 @@ struct SVSIndexBase {
     virtual ~SVSIndexBase() = default;
     virtual int addVectors(const void *vectors_data, const labelType *labels, size_t n) = 0;
     virtual int deleteVectors(const labelType *labels, size_t n) = 0;
+    virtual bool isLabelExists(const labelType label) const = 0;
 };
 
 template <typename MetricType, typename DataType, size_t QuantBits, size_t ResidualBits = 0>
@@ -243,6 +244,10 @@ class SVSIndex : public VecSimIndexAbstract<svs_details::vecsim_dt<DataType>, fl
 
     ~SVSIndex() = default;
 
+    bool isLabelExists(const labelType label) const override {
+        return impl_ ? impl_->has_id(label) : false;
+    }
+
     size_t indexSize() const override { return impl_ ? impl_->size() : 0; }
 
     size_t indexCapacity() const override {
@@ -258,7 +263,7 @@ class SVSIndex : public VecSimIndexAbstract<svs_details::vecsim_dt<DataType>, fl
         return info;
     }
 
-    VecSimIndexDInfo debugInfo() const override {
+    VecSimIndexDebugInfo debugInfo() const override {
         VecSimIndexDebugInfo info;
         info.commonInfo = this->getCommonInfo();
         info.commonInfo.basicInfo.algo = VecSimAlgo_SVS;
@@ -469,6 +474,14 @@ class SVSIndex : public VecSimIndexAbstract<svs_details::vecsim_dt<DataType>, fl
         return res;
     }
 
+    void runGC() override {
+        if (impl_) {
+            impl_->consolidate();
+            impl_->compact();
+        }
+        changes_num = 0;
+    }
+
 #ifdef BUILD_TESTS
     virtual void fitMemory() {};
 #endif