docs: add docs for integrating MCP Toolbox for Databases as tool(s)

[CasperGN]

Thank you for helping make the Dapr documentation better!

Please follow this checklist before submitting:

• Commits are signed with Developer Certificate of Origin (DCO - learn more)
• Read the contribution guide
• Commands include options for Linux, MacOS, and Windows within tabpane
• New file and folder names are globally unique
• Page references use shortcodes instead of markdown or URL links
• Images use HTML style and have alternative text
• Places where multiple code/command options are given have tabpane

In addition, please fill out the following to help reviewers understand this pull request:

Description

Update Dapr Agents with reference to MCP Tool for Databases for when dapr/dapr-agents#293 is merged.

Issue reference

N/A

[bibryam]

I would prefer us to keep the core concept page only to explain generic/broad "core concepts" in DA. And right now that page is already pretty long.
Concrete integrations with specific libraries from the Python ecosystem should be in the integrations page.
https://docs.dapr.io/developing-applications/dapr-agents/dapr-agents-integrations/
If you move it there, the content LGTM