Map<String, CompactionPolicySwitchInfo> getBlobToCompactionPolicySwitchInfoMap() {
    return this.blobToCompactionPolicySwitchInfoMap;
  }
@return blobToCompactionPolicySwitchInfoMap which key is storeId and value is {@link CompactionPolicySwitchInfo}
ambry-store/src/main/java/com/github/ambry/store/HybridCompactionPolicy.java