Add commands to close a test run created with add_run

[cgeisel]

What would you like the TestRail CLI to be able to do?

I'd like to be able to create a run using the add_run command recently added by #236 and then use a similar command to close the run with similar syntax, with the option to use the yaml file produced by add_run.

Why is this feature necessary on the TestRail CLI?

I'm using parse_junit in my CI pipeline to upload multiple JUnit reports and preceding this automation with an add_run command to create a run for all of them to use. At the moment my automation has fairly brittle logic that loops through a list of reports and when it detects the last report, runs parse_junit with the --close-run flag to close the run. The problem with this approach is that if the parse_junit command fails for any reason, the run is left open, which is not ideal for our internal process.

More details

Here's the type of logic I'd like to support:

1. trcli add_run...
2. loop through list of junit reports and trcli parse_junit using a config.yml produced by add_run
3. handle errors
4. trcli close_run...

Interested in implementing it yourself?

Yes

[jakec-routable]

I implemented something like this in Routable's fork. Let me know if you just want me to make a PR from it.