[NO ISSUE][COMP][RT] Enable multiway similarity joins - Enable the FuzzyJoinRule that transforms a nested-loop-similarity-join plan to a three-stage-similarity join. - Modify FuzzyJoinRuleCollections. - Add the ExtractCommonExpressionRule to extract common expressions in the star-like multiple similarity join substitutions. - Add the InlineSubplanInputForNestedTupleSourceRule to translate the generated subplan from the similarity function-derived substitution into join in case of nested schemas. - Use similarity-jaccard-prefix to enable the pp+ join strategy. - Use the right side to build the heavy hash join on the prefix tokens from both sides. - Add RemoveAssign/Variables/AggRules to iteratively remove unused assign/vars once FuzzyJoinRule is applied in each round. - Add three new optimization cases for multiway similarity joins. - link-like multiway similarity joins - star-like multiway similarity joins - hybrid multiway similarity joins with the both styles of similarity joins. - Add a check whether a similarity function is on a select over an existing similarity join. - Change the inverted-index-based similarity join to the three-stage-similarity join due to efficiency considerations.