package refactoring for SoC

[hohwille]

This PR contains a cleanup refactoring

Implemented changes:

• Refactor package structure for Separation of Concerns
• Now things that logically belong together are in the same package regarding tool related stuff.
• E.g. MvnArtifact and MvnRepository are together with Mvn commandlet inside the mvn sub-package.
• The same for npm, pip, etc.

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Checklist for this PR

Make sure everything is checked before merging this PR. For further info please also see
our DoD.

• When running mvn clean test locally all tests pass and build is successful
• PR title is of the form #«issue-id»: «brief summary» (e.g. #921: fixed setup.bat). If no issue ID exists, title only.
• PR top-level comment summarizes what has been done and contains link to addressed issue(s)
• PR and issue(s) have suitable labels
• Issue is set to In Progress and assigned to you or there is no issue (might happen for very small PRs)
• You followed all coding conventions
• You have added the issue implemented by your PR in CHANGELOG.adoc unless issue is labeled
  with internal

[coveralls]

Pull Request Test Coverage Report for Build 20930596111

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 4 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+0.01%) to 69.914%

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Files with Coverage Reduction	New Missed Lines	%
com/devonfw/tools/ide/tool/repository/ArtifactToolRepository.java	1	92.31%
com/devonfw/tools/ide/tool/mvn/MvnArtifact.java	3	88.0%

Totals
Change from base Build 20848427570:	0.01%
Covered Lines:	10193
Relevant Lines:	14003

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💛 - Coveralls