Proper support for fork + for from directory + solution show

[pnickolov]

Description

Implemented a new internal object to read and keep in memory the full solution, with all its files.

Added solution show command that displays solution's elements: for now, list of files with annotation of their contents (e.g., knowledge vs. object, object type, etc.)

Added support for solution fork from a local directory, as this helps primers/tutorials/workshops and works around the restricted ability to download solutions from other tenants.

Modified the fork capability to not just do global replace (which can inadvertently replace more than necessary and break a solution); instead, it ensures that only values are changed (never keys) and only on word boundary. Additional exceptions are handled, such as renaming the namespace file (which is usually named after the solution name).

Retained the old fork capability for backward compatibility, under a --legacy-replace flag, in case the new algorithm doesn't take care of some cases that are covered in tutorials and workshops.

Type of Change

• Bug Fix
• New Feature
• Breaking Change
• Refactor
• Documentation
• Other (please describe)

Checklist

• I have read the contributing guidelines
• Existing issues have been referenced (where applicable)
• I have verified this change is not present in other open pull requests
• Functionality is documented
• All code style checks pass
• New code contribution is covered by automated tests
• All new and existing tests pass