timeout support for moon test #1290

Supports timeout when running moon test.

Motivation

Some test will hang due to bugs in library, dead loops, and potentially bugs in moon. Adding timeout for moon test can help user to better spot the issue.

Detailed Description

1. Support --timeout <timeout> in command line arguments in moon test, specifying the timeout applied to this run of moon test.
2. Support "test-timeout" configuration in moon.pkg.json, for CI usage.
3. The <timeout> supports human-readable notation of time duration, like 10s, 1m, 1h.

Related Issues

• bug(moon): coverage::clean test hangs occasionally maria#255
• Fix moon hanging in macos tests: moonbitlang/maria#255 #1156
• refactor(spawn): use real pid maria#754
• Command .wait hanging on MacOS tokio-rs/tokio#6770
• process: block SIGCHLD signal when spawning process tokio-rs/tokio#6953

Checklist

• I have added all necessary details to make it easy for the maintainers to understand my request.