feat: allow to specify folder for init

[roel4ez]

Checklist

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• [ ] Versions update reflected in all places (both init.py files, CHANGELOG, setup.py, setup.cfg)
• [x] Unit tests pass locally
• [x] Quickstart steps locally validated
• [ ] Passes unit tests in CICD pipeline (green on Github pipeline)
• [ ] Pypi RC version passes Edge CICD pipeline validation for cross-tool validation
• [x] Pull request includes test coverage for the included changes
• [x] Documentation is updated for the included changes

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• [x] Title of the pull request is clear and informative.
• [x] There are a small number of commits, each of which have an informative message. This means that previously merged commits do not appear in the history of the PR.

Description

Fixes #556

Adds an argument to the iotedgedev init command, which specifies the name of the folder where the solution will be created. Defaults to . if not provided.

Additional information

Changed the way the init command is calling is calling the create command: it now calls the constructor of the Solution directly instead of going through the call_proc.

[roel4ez]

sorry this was taking a while - has a busy week. Looking into it again.