Cursorless snippet format

Cursorless has experimental support for snippets. Currently these snippets are just used for wrapping targets.

The best place to start is to look at the core cursorless snippets. Additionally, there is autocomplete with documentation as you're writing a snippet.

Note that for body, we support the full textmate syntax supported by VSCode, but we prefer to use variable names (eg $foo) instead of placeholders (eg $1) so that it is easy to use snippets for wrapping.