Insertion snippets potential follow-up actions

[pokey]

• [ ] Support specifying order of snippet holes rather than document order, eg for list comprehension
• [ ] Send text replacement through as tab stop default value, and then issue next tabstop command?
• [ ] Remove commits from other PRs
• [ ] Support "strict" mode for phrasal snippets
• [ ] https://github.com/pokey/cursorless-vscode/discussions/499