[eas-cli] Make simulator the index command

[szdziedzic]

Summary

• move the simulator start implementation from simulator/start.ts to simulator/index.ts
• make eas simulator the canonical command and retain eas simulator:start as an alias
• preserve the hidden status of the experimental simulator command family

Why

simulator:start was the canonical oclif command and simulator was only an alias. Making simulator the index command establishes the shorter form as canonical while preserving compatibility with simulator:start.

Validation

• corepack yarn build
• corepack yarn test src/commands/simulator --runInBand (45 tests)
• oxfmt --check on modified files
• oxlint --type-aware --import-plugin on modified files
• packages/eas-cli/bin/run simulator --help
• packages/eas-cli/bin/run simulator:start --help
• corepack yarn lint-changelog

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 62.20%. Comparing base (2e00719) to head (2bdd631).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4112   +/-   ##
=======================================
  Coverage   62.20%   62.20%           
=======================================
  Files         994      994           
  Lines       44716    44716           
  Branches     9409     9409           
=======================================
  Hits        27812    27812           
  Misses      15457    15457           
  Partials     1447     1447           

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[github-actions]

✅ Thank you for adding the changelog entry!

[github-actions]

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File Patterns	Mentions
packages/eas-cli/**	@douglowder

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