refactor the Collection class into multiple manager classes

.changeset/little-hats-build.md

@@ -0,0 +1,8 @@
+---
+"@tanstack/electric-db-collection": patch
+"@tanstack/query-db-collection": patch
+"@tanstack/rxdb-db-collection": patch
+"@tanstack/db": patch
+---
+
+Refactor the main Collection class into smaller classes to make it easier to maintain.

packages/db/src/change-events.ts

@@ -9,7 +9,7 @@ import type {
   CurrentStateAsChangesOptions,
   SubscribeChangesOptions,
 } from "./types"
-import type { Collection } from "./collection"
+import type { Collection } from "./collection/index.js"
 import type { SingleRowRefProxy } from "./query/builder/ref-proxy"
 import type { BasicExpression } from "./query/ir.js"