Create tool to automatically migrate Cursorless snippets to community snippets

[pokey]

We are moving towards the new community snippet format. Existing users who have defined their snippets using the current Cursorless representation will probably want to migrate their snippets to the community representation. We would like to create a tool to automate this process

[fidgetingbits]

I was just poking around different snippets across cursorless and talon, and I noticed one discrepancy which is that for cursorless we use langId: "shellscript" but in the community it matches against the language id identified by talon, so in my case zsh or bash. This will be something to keep in mind when migrating between the two, although if it's only the format changing and the snippets files themselves won't be shared across both, then it probably doesn't matter.

[AndreasArvidsson]

Tracking this in #2355