Fix crewai reset-memories when Embedding dimension mismatch (#2737)

* fix: support to reset memories after changing Crew's embedder

The sources must not be added while initializing the Knowledge otherwise we could not reset it

* chore: improve reset memory feedback

Previously, even when no memories were actually erased, we logged that they had been. From now on, the log will specify which memory has been reset.

* feat: improve get_crew discovery from a single file

Crew instances can now be discovered from any function or method with a return type annotation of -> Crew, as well as from module-level attributes assigned to a Crew instance. Additionally, crews can be retrieved from within a Flow

* refactor: make add_sources a public method from Knowledge

src/crewai/knowledge/knowledge.py

@@ -41,7 +41,6 @@ class Knowledge(BaseModel):
             )
         self.sources = sources
         self.storage.initialize_knowledge_storage()
-        self._add_sources()
 
     def query(
         self, query: List[str], results_limit: int = 3, score_threshold: float = 0.35
@@ -63,7 +62,7 @@ class Knowledge(BaseModel):
         )
         return results
 
-    def _add_sources(self):
+    def add_sources(self):
         try:
             for source in self.sources:
                 source.storage = self.storage