🪨 feat: Add Bedrock Prompt Caching Support (#8271)

* feat: Add Bedrock Cache Control Functionality

- fix: Update Bedrock Cache Control to Require cachePoint as a Separate Content Block

- Modified the addBedrockCacheControl function to ensure cachePoint is added as a separate content block in the content array, rather than as a property of text objects.

- refactor: move addBedrockCacheControl over to packages/api

- ci: add tests for addBedrockCacheControl until full coverage reached

* ci: add test similar to example from the langchain PR

* refactor: move addBedrockCacheControl logic and tests to agents repository

* chore: remove extraneous comment

* chore: update @librechat/agents dependency to version 3.0.12

* chore: update @librechat/agents dependency to version 3.0.13

* chore: update @librechat/agents dependency to version 3.0.14

* chore: update @librechat/agents to v3.0.15

* chore: update default value for prompt cache setting to true

* refactor: set default promptCache to true for claude and nova models

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Co-authored-by: Danny Avila <danny@librechat.ai>

api/package.json

@@ -47,7 +47,7 @@
     "@langchain/google-genai": "^0.2.13",
     "@langchain/google-vertexai": "^0.2.13",
     "@langchain/textsplitters": "^0.1.0",
-    "@librechat/agents": "^3.0.11",
+    "@librechat/agents": "^3.0.15",
     "@librechat/api": "*",
     "@librechat/data-schemas": "*",
     "@microsoft/microsoft-graph-client": "^3.0.7",