[MNG-8637] Pull out "Standalone API" from UTs

[jira-importer]

Tamas Cservenak opened MNG-8637 and commented

We have means to boot Maven in "Standalone API" (ie. "maven without maven") to perform mostly Resolver-only tasks. This code is currently in maven-impl UTs.

This code needs to be pulled out and made reusable, as this should become "the proper way" to utilize Maven 4 in 'MIMA-like scenarios'.

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Issue Links:

• MRESOLVER-693 Deprecate mvn4 supplier module
  ("is required by")

Remote Links:

• GitHub Pull Request #2226