feat(amazonq): paid tier

[justinmk3]

Problem

When Builder Id customers hit the "free tier" limit, there is no guidance.

Solution

Depends on this Flare change: aws/language-servers#1197

• Update to latest Flare release, which:
  • auto-detects when the free-tier limit is reached
  • shows a chat card with an inputbox for aws account id
  • handles when the user clicks "Upgrade"
  • waits for upgrade to complete and updates chat UI
• Add a Manage Subscriptions menu item, which invokes the Flare aws/chat/manageSubscription command.
• Handle ShowDocumentParams.external. This is a standard lsp interface, and is required by the new Flare logic.
  • fix(lsp): handle ShowDocumentParams.external #7415

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