feat: many improvements to error handling/reporting

[tigarmo]

This PR contains multiple "small" improvements/fixes related to error handling and reporting. Each change is in a separate commit. They are:

• Set craft-cli dep to the temporary "rockcraft" working branch;
• Stop raising CraftValidationError from validators - raise ValueError, TypeError, etc instead;
• Normalize validation error messages so that they have a more consistent presentation;
• Use from_yaml_data() in the BuildPlanner so that error translation/prettifying happens;
• Set docs url and slugs for validation errors in CraftBaseModels.

The PR is currently failing because it needs https://github.com/canonical/craft-cli/pull/257