docs: Add GOAT integration to docs (#30478)

This PR adds:
1. Docs for the GOAT integration 
2. An "Agentic Finance" table to the Tools page that includes GOAT

**Twitter handle**: @0xaguspunk

libs/packages.yml

@@ -2,6 +2,11 @@
 # it is EXPERIMENTAL and may be removed in the future
 
 packages:
+- name: goat-sdk-adapter-langchain
+  path: python/src/adapters/langchain
+  repo: goat-sdk/goat
+  name_title: GOAT SDK
+  provider_page: goat
 - name: langchain-core
   path: libs/core
   repo: langchain-ai/langchain
@@ -559,4 +564,4 @@ packages:
   repo: memgraph/langchain-memgraph
 - name: langchain-vectara
   path: libs/vectara
-  repo: vectara/langchain-vectara
+  repo: vectara/langchain-vectara