Documentation: Updated Performance Comparisons

[cgillum]

Documentation exists that covers the performance numbers for the MSSQL backend, but it hasn't been updated for quite a while. Since then, several new features have been added and performance improving fixes have been made. As part of the v1.0.0 release, we need to update this documentation with up-to-date numbers. Ideally, we'll also include a couple more scenarios in addition to "Hello Cities".

[cgillum]

Updated numbers have been added. I decided to keep the "Hello Cities" scenario as-is since it turns out to be pretty representative of real-world usage.

[IGx89]

Hi! Would you mind sharing a link to this document with performance numbers? The linked document above doesn't mention MSSQL.

[cgillum]

https://microsoft.github.io/durabletask-mssql/#/scaling?id=orchestration-throughput-benchmarks