feat: add "extract to module" functionality

[polatengin]

Fixes #14482

Description

• Adds a VS Code “Extract to Module...” command that sends a new bicep/extractToModule LSP request, writes the generated module file, replaces the selected top-level resources with a module declaration, and initiates rename on the module symbol.
• Language server validates selections (whole top-level resources only, no external references), lifts external params/vars into module parameters, builds the module text, and emits success/failure telemetry for extract-to-module operations.

Checklist

• I have read and adhere to the contribution guide.

Microsoft Reviewers: Open in CodeFlow

[github-actions]

Test this change out locally with the following install scripts (Action run 20732840565)

VSCode

• Mac/Linux

  bash <(curl -Ls https://aka.ms/bicep/nightly-vsix.sh) --run-id 20732840565

• Windows

  iex "& { $(irm https://aka.ms/bicep/nightly-vsix.ps1) } -RunId 20732840565"

Azure CLI

• Mac/Linux

  bash <(curl -Ls https://aka.ms/bicep/nightly-cli.sh) --run-id 20732840565

• Windows

  iex "& { $(irm https://aka.ms/bicep/nightly-cli.ps1) } -RunId 20732840565"