rename search subscriber
fix: comments in medusa-interfaces/search-service.js
add: use cursor pagination when indexing all products to search engine
fix: emit product_id on product-variant creation
fix: move search API route under products/search
fix: use meilisearchService instead of searchService in plugin loader
add SearchService interface to medusa-interfaces
add DefaultSearchService skeleton implementation to core
add search-index.js loader to core for indexing db documents
add SearchSubscriber to core
add loadToSearchEngine method in ProductService
switch order of loaders in core to load subscriptions AFTER plugins
adjust service and loader for medusa-plugin-meilisearch