Remove just-scripts-utils and just-task-logger packages

[ecraig12345]

Originally just-scripts-utils and just-task-logger were used by multiple packages in the Just family (such as for repo creation and management), but now that the focus of Just has been narrowed to task orchestration, those utils are only directly used in one package each.

This PR merges just-scripts-utils into just-scripts, and just-task-logger into just-task. This simplifies the repo setup and reduces maintenance overhead a bit.

Based on internal usage, the following new exports were added to replace those from the util packages:

• just-scripts: encodeArgs