chore: adds config options relevant for MCP server MCP-133

[himanshusinghs]

Description

We're adding a few configuration options that should be in user's control and will be injected into the MCP server started by the VSCode extension.

Checklist

• New tests and/or benchmarks are included
• Documentation is changed or added
• I have signed the MongoDB Contributor License Agreement (https://www.mongodb.com/legal/contributor-agreement)

Motivation and Context

• Bugfix
• New feature
• Dependency update
• Misc

Open Questions

Dependents

Types of changes

• Backport Needed
• Patch (non-breaking change which fixes an issue)
• Minor (non-breaking change which adds functionality)
• Major (fix or feature that would cause existing functionality to change)

[nirinchev]

We may want to clarify that these settings apply to the MCP server exposed by the vscode extension. Currently, the descriptions are a little ambiguous as if I read

When set to true, only allows read, connect, and metadata operation types, disabling create/update/delete operations

without noticing that the setting is mdb.mcp.readOnly, I may assume this is a config option for the vscode extension as a whole.