feat: agent node add memory

[Nov1c444]

Summary

Added memory functionality to Agent nodes. Now the Agent can reason based on chat context.

This PR needs to be merged after PR #15732

Screenshots

Checklist

[!IMPORTANT]
Please review the checklist below before submitting your pull request.

• [ ] This change requires a documentation update, included: Dify Document
• [x] I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• [x] I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• [x] I've updated the documentation accordingly.
• [x] I ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods

[crazywoola]

@dosubot find related issues.

[juniorsereno]

We need it

[tushverma]

Hello @Nov1c444 - How can I access Memory feature in Agent Node ? I am using the latest release v1.2.0

[CCHOT]

docker-compose.yaml 中的几个镜像修改成main 可以看到： langgenius/dify-api:main，langgenius/dify-web:main， langgenius/dify-plugin-daemon:main-local

[Nov1c444]

Hello @Nov1c444 - How can I access Memory feature in Agent Node ? I am using the latest release v1.2.0

You could update the plugin version to 0.0.13. If you have previously installed 0.0.13, please also update the plugin version. After updating, you will be able to see the memory option.