feat(search): add interface for similarity algorithms

Added a new interface `Similarity` for search algorithm implementations. Updated `JaccardSimilarity` class to implement this interface.

core/src/main/kotlin/com/phodal/shirecore/search/algorithm/JaccardSimilarity.kt

@@ -2,7 +2,7 @@ package com.phodal.shirecore.search.algorithm
 
 import com.phodal.shirecore.search.tokenizer.StopwordsBasedTokenizer
 
-open class JaccardSimilarity {
+open class JaccardSimilarity : Similarity {
     /**
      * The `tokenLevelJaccardSimilarity` method calculates the Jaccard similarity between a query string and an array of string
      * arrays (chunks). The Jaccard similarity is a measure of the similarity between two sets and is defined as the size of

core/src/main/kotlin/com/phodal/shirecore/search/algorithm/Similarity.kt

@@ -0,0 +1,5 @@
+package com.phodal.shirecore.search.algorithm
+
+interface Similarity {
+
+}