Add inline generation features with hotkeys, context menu, and streaming; add raw prompt logging for debugging

[Mithadon]

Added features:

• Inline generation within the editor, with support for streaming, along with associated hotkeys and right-click context menu actions:

1. Highlight text to limit the generation's context to the highlighted text
2. Generate text at the cursor location, using what is above the cursor as context (but nothing below the cursor)
3. Highlight text and use it as context with added instructions (an input popup appears). This is in contrast to the existing feature which uses the highlighted text as a prompt, verbatim.

• An option to automatically create logs of the raw prompts sent to the model. Very useful for debugging and learning how to use the plugin.