chore(*): build plugins, cjs compat

[hntrl]

• Adapts the build system to a "plugin config per workspace" based approach
• Reformats the existing build plugins to use tsdown params
• Adds a cjs compatibility plugin
  • this works by looking at a special BUILD_MODE env var that will output cjs compatible file shims
  • the changesets release script has been updated to use it

Fixes #9420
Fixes #9417
Fixes #9300
Fixes #9270
Fixes #9269
Fixes #9268
Fixes #9252

[changeset-bot]

🦋 Changeset detected

Latest commit: fbfb52d

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 40 packages

Name	Type
@langchain/azure-dynamic-sessions	Patch
@langchain/google-cloud-sql-pg	Patch
@langchain/google-vertexai-web	Patch
@langchain/google-vertexai	Patch
@langchain/azure-cosmosdb	Patch
@langchain/google-webauth	Patch
@langchain/baidu-qianfan	Patch
@langchain/google-common	Patch
@langchain/mixedbread-ai	Patch
@langchain/google-gauth	Patch
@langchain/google-genai	Patch
@langchain/cloudflare	Patch
@langchain/anthropic	Patch
@langchain/mistralai	Patch
@langchain/cerebras	Patch
@langchain/deepseek	Patch
@langchain/pinecone	Patch
@langchain/weaviate	Patch
@langchain/mongodb	Patch
@langchain/cohere	Patch
@langchain/ollama	Patch
@langchain/openai	Patch
@langchain/qdrant	Patch
@langchain/tavily	Patch
@langchain/yandex	Patch
@langchain/nomic	Patch
@langchain/redis	Patch
@langchain/standard-tests	Patch
@langchain/groq	Patch
@langchain/textsplitters	Patch
@langchain/aws	Patch
@langchain/exa	Patch
@langchain/xai	Patch
@langchain/mcp-adapters	Patch
@langchain/community	Patch
@langchain/classic	Patch
@langchain/core	Patch
@langchain/eslint	Patch
@langchain/build	Patch
langchain	Patch

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