refactor: remove redundant AnswerSimilarity from collections API in favor of SemanticSimilarity (#2410)

## Issue Link / Problem Description
<!-- Link to related issue or describe the problem this PR solves -->
- Fixes #2409

Author: anistark

src/ragas/metrics/collections/__init__.py

@@ -3,7 +3,6 @@
 from ragas.metrics.collections._answer_accuracy import AnswerAccuracy
 from ragas.metrics.collections._answer_correctness import AnswerCorrectness
 from ragas.metrics.collections._answer_relevancy import AnswerRelevancy
-from ragas.metrics.collections._answer_similarity import AnswerSimilarity
 from ragas.metrics.collections._bleu_score import BleuScore
 from ragas.metrics.collections._context_entity_recall import ContextEntityRecall
 from ragas.metrics.collections._context_precision import (
@@ -32,7 +31,6 @@
     "AnswerAccuracy",
     "AnswerCorrectness",
     "AnswerRelevancy",
-    "AnswerSimilarity",
     "BleuScore",
     "ContextEntityRecall",
     "ContextPrecision",