Support code completion for inline snippet render arguments

[dejmedus]

• closes https://github.com/Shopify/developer-tools-team/issues/828

What are you adding in this PR?

While rendering an inline snippet that contains a doc tag we should be offered argument completion suggestions

Demo

https://github.com/user-attachments/assets/154d911d-1669-4265-ba20-5f1b79e57ac0

How to test

Pull down the branch gh pr checkout 1075

• Completion options defined a snippets doc tag should display as expected
• Only unused options should display
• Options from nested snippet doc tags should not be offered, only the current scope

Notes: Since this branch isn't based off of the doc tags branch red squiggles will show up on snippets, but render completion should work as expected. VSCode displays param definitions, Cursor does not

Before you deploy

• [x] I included a minor bump changeset
• [x] My feature is backward compatible