[WIP] Proposal: Tool for summarizing CI results

We have added a few "experimental" CI jobs lately, e.g. [`execute_rom_fpga_jtag_tests_cw310`](https://cs.opensource.google/opentitan/opentitan/+/master:azure-pipelines.yml;l=548;drc=f3a21fc7339ae5ca9883a93392435d187811f332). To my knowledge, the [Azure UI](https://dev.azure.com/lowrisc/opentitan) doesn't make it easy to evaluate the last N runs of a particular job.

I propose making a tool that uses the [Azure Pipelines API](https://learn.microsoft.com/en-us/rest/api/azure/devops/) to list recent CI runs and break down results by job. The output should be a table where each row is a CI run and columns are individual jobs. Each cell in the table should indicate the results of the run.

[**Edit**] I played with the API, but I couldn't figure out how to list the jobs inside of a [`Run`](https://learn.microsoft.com/en-us/rest/api/azure/devops/pipelines/runs/get?view=azure-devops-rest-7.1#run). I can list `Project`s, `Pipeline`s, and `Run`s, but that critical step of enumerating jobs within a `Run` eludes me. Perhaps my mental model is wrong.

## Output format

To start, it would be simplest to print a table to the command line. Later, I bet an HTML table with clickable links would be easier to use.

## Open design question: Which programming language?

This is a very low-stakes project, so I'd like to just take the path of least resistance.

I thought I'd avoid Python because `http.client` does not support HTTP/2. I started prototyping in Rust and realized there's no built-in HTTP client, so I'd have to choose and add a third-party library which is a bit of a headache. I've had great success with Go's `net/http` client before, which supports HTTP/2. However, it looks like the OpenTitan repo doesn't have any Go code — it's probably nice to get some wider approval before adding code in a new language.

[**Edit**] Coming back to this, I think the path of least resistance is to pull in third-party [client library](https://learn.microsoft.com/en-us/rest/api/azure/devops/?view=azure-devops-rest-7.1#client-libraries).

## Open question: Does this belong in the OpenTitan repo?

I suppose there's no reason this needs to be coupled to OpenTitan.