[SUREFIRE-1405] Allow provider to override default runOrder & RunOrderCalculator from surefire-api

**[Dipak Pawar](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=dipakpawar231)** opened **[SUREFIRE-1405](https://issues.apache.org/jira/browse/SUREFIRE-1405?redirect=false)** and commented

* Currently surefire supports "alphabetical", "reversealphabetical", "random", "hourly", "failedfirst", "balanced" and "filesystem" runOrder.
* All supported options are hardCoded in RunOrder - https://github.com/apache/maven-surefire/blob/master/surefire-api/src/main/java/org/apache/maven/surefire/util/RunOrder.java#L109
* There is no way for user to add new runOrder in new provider implemented by him.
* Allow user to override/add new runOrder & RunOrderCalculator implementaion so surefire-api will dynamically load all supported runOrder & decide which RunOrderCalculator implementation to use for ordering test classes depending on provided runOrders.

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**Remote Links:**
- [GitHub Pull Request #169
](https://github.com/apache/maven-surefire/pull/169)
- [GitHub Pull Request #169
](https://github.com/apache/maven-surefire/pull/169)

Start with surefire-api/src/main/java/org/apache/maven/surefire/util/RunOrder.java at the hard-coded supported options, then review the provider and RunOrderCalculator integration. Read GitHub pull request #169 for prior work and context. Done means providers can add or override runOrder values and surefire-api dynamically selects the corresponding RunOrderCalculator.

Written by the indexing model from the issue text.