feat: Add loc command

[jcs090218]

Example output:

$ eask loc
  - Skipping markdown-mode (20240107.831)... already installed X
Retrieving LOC information... done v

|-------------------------------------------------|-------|------------|
| File                                            | Lines | Characters |
|-------------------------------------------------|-------|------------|
| d:/_workspace/_eask/openai/openai.el            | 257   | 8604       |
| d:/_workspace/_eask/openai/openai-audio.el      | 116   | 4644       |
| d:/_workspace/_eask/openai/openai-chat.el       | 124   | 4404       |
| d:/_workspace/_eask/openai/openai-completion.el | 172   | 6483       |
| d:/_workspace/_eask/openai/openai-edit.el       | 93    | 3317       |
| d:/_workspace/_eask/openai/openai-embedding.el  | 73    | 2702       |
| d:/_workspace/_eask/openai/openai-engine.el     | 122   | 4309       |
| d:/_workspace/_eask/openai/openai-file.el       | 305   | 11131      |
| d:/_workspace/_eask/openai/openai-fine-tune.el  | 264   | 10538      |
| d:/_workspace/_eask/openai/openai-image.el      | 259   | 9968       |
| d:/_workspace/_eask/openai/openai-model.el      | 125   | 4276       |
| d:/_workspace/_eask/openai/openai-moderation.el | 68    | 2413       |
|-------------------------------------------------|-------|------------|
| Total                                           | 1978  | 72789      |