MCP Node ConnectionString support

[sitefinitysteve]

dotnet supports a regular connection string, but Node seems to only support Azure connections. I could just use dotnet, but it doesn't appear to support the READONLY to restrict tool access per #56 would just be nice for both to have feature parity?

[sitefinitysteve]

Added Readonly in PR #64

[AV25242]

@sitefinitysteve thanks for your contributions, yes there is a parity, and we are also working on it