feat(util): added `gptme-util prompts workspace/git/journal` helper commands

[ErikBjare]

The idea is to move the helper scripts for prompt generation in gptme-bob into gptme.

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[!IMPORTANT] Adds new CLI commands to gptme for generating git, workspace, and journal prompts, enhancing context generation capabilities.

• New CLI Commands:
  • Adds prompts git command in gptme/util/cli.py for generating git repository summaries with options like --branch, --since, --max-files, and --show-diff.
  • Adds prompts workspace command in gptme/util/cli_context.py to display directory structure as a tree, respecting .gitignore.
  • Adds prompts journal command in gptme/util/cli_context.py to generate prompts from journal entries.
• Functionality:
  • context_git() in cli_context.py gathers git status, diffs, and recent commits.
  • context_workspace() in cli_context.py shows directory structure and file statistics.
  • context_journal() in cli_context.py retrieves journal entries from specified directories.
• Integration:
  • Updates get_workspace_prompt() in gptme/prompts.py to include references to prompts_git and prompts_workspace.

^{This description was created by for 21b39820b0a514ceb44c17b402e33086a1a68bf7. It will automatically update as commits are pushed.}

[codecov-commenter]

:x: 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
86	1	85	0

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::tests.test_util_cli

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