Support comments for manually editing hunks

[ValdezFOmar]

When you manually edit a hunk with git add --patch file, git creates sort of a 'diff' file with comments (lines starting with # similar to git commit -e) that you can manually edit, but currently those comments are parsed as context nodes.

Example:

```diff # Manual hunk edit mode -- see bottom for a quick guide. @@ -32,20 +32,19 @@ body { max-width: 800px; min-height: 100%; background-color: var(--bg); - padding: 1.5rem 2rem; + padding: 0.5rem 2rem 1rem; box-shadow: 0 0 40px 40px #070707EE; } - p { text-align: justify; - line-height: 1.3; } p, ul, ol { letter-spacing: 0.5px; + line-height: 1.3; } :is(ul, ol) li { # --- # To remove '-' lines, make them ' ' lines (context). # To remove '+' lines, delete them. # Lines starting with # will be removed. # If the patch applies cleanly, the edited hunk will immediately be marked for staging. # If it does not apply cleanly, you will be given an opportunity to # edit again. If all lines of the hunk are removed, then the edit is # aborted and the hunk is left unchanged. ```

Tree

```scm (context) ; [1:1 - 56] (location) ; [2:1 - 26] (linerange) ; [2:4 - 9] (linerange) ; [2:11 - 16] (context) ; [3:1 - 22] (context) ; [4:1 - 22] (context) ; [5:1 - 33] (deletion) ; [6:1 - 26] (addition) ; [7:1 - 31] (context) ; [8:1 - 41] (context) ; [9:1 - 2] (deletion) ; [11:1 - 1] (context) ; [12:1 - 4] (context) ; [13:1 - 25] (deletion) ; [14:1 - 22] (context) ; [15:1 - 2] (context) ; [17:1 - 3] (context) ; [18:1 - 4] (context) ; [19:1 - 5] (context) ; [20:1 - 27] (addition) ; [21:1 - 22] (context) ; [22:1 - 2] (context) ; [24:1 - 17] (context) ; [25:1 - 5] (context) ; [26:1 - 53] (context) ; [27:1 - 35] (context) ; [28:1 - 40] (context) ; [29:1 - 87] (context) ; [30:1 - 67] (context) ; [31:1 - 69] (context) ; [32:1 - 41] ```

[the-mikedavis]

I think this would be ok to add. The # at the line start is unique so it should be unambiguous