[SUREFIRE-1529] Implement test bucketing

**[Zsombor Gegesy](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=zsombor)** opened **[SUREFIRE-1529](https://issues.apache.org/jira/browse/SUREFIRE-1529?redirect=false)** and commented

There are projects, which has hundreds or thousands of test, which took hours to complete - to paralelize this, it would be good, if tests could be partitioned automatically into buckets - of course perfect bucketization is not feasible, due to lack of knowledge of test run times (and it would be a NP-complete problem even that case).

The idea is to start tests concurrently, in different machines, something like this:
1. mvn test -DnumberOfBuckets=3 -DbucketId=0
2. mvn test -DnumberOfBuckets=3 -DbucketId=1
3. mvn test -DnumberOfBuckets=3 -DbucketId=2

 And the results could be collected and aggregated later by external processes.

The current solution is to manually collect the tests, and generate huge command lines to do the same.

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**Affects:** 2.22.0

**Attachments:**
- [SUREFIRE-1529.patch](https://issues.apache.org/jira/secure/attachment/12929203/SUREFIRE-1529.patch) (_3.41 kB_)

**Issue Links:**
- [SUREFIRE-1477](https://issues.apache.org/jira/browse/SUREFIRE-1477) CI support for parallel test execution
(_**"duplicates"**_)

**Remote Links:**
- [GitHub Pull Request #187
](https://github.com/apache/maven-surefire/pull/187)

6 votes, 6 watchers

Start by reviewing the Maven test commands in the issue and the attached SUREFIRE-1529.patch, then compare the related GitHub pull request #187. Done means tests can be partitioned across the requested bucket IDs and their results remain available for external collection and aggregation.

Written by the indexing model from the issue text.