Add exclip

[asmacdo]

This assists with a common workflow, where I need to execute a script, and copy to clipboard both the script and result in markdown format so I can paste to github comment/issue.

First usage: https://github.com/con/yolo/pull/7#discussion_r2518829449

[asmacdo]

From @yarikoptic would be nice to wrap with

too! Lets add flags: --detail-script --detail-output (--details does both)

<details>
<summary></summary> 

```shell

```
</details>

[asmacdo]

Updated output

Exectuting exclip ./hi.sh produces:

hi.sh

#!/bin/sh
echo "HI"

Output

HI

Exectuging exclip --plain ./hi.sh produces:

./hi.sh

#!/bin/sh
echo "HI"

HI