[2/N] Add update context

[cccclai]

Stack from ghstack (oldest at bottom):

• [5/N] Add update in method #11463
• [4/N] Add backend options map #11462
• [3/N] Add update function in backend interface #11391
• -> [2/N] Add update context #11390
• [1/N] Add BackendOptions class #11389

For future needs without breacking API BC, in case we need to pass more information to the update API

Differential Revision: D75919212

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/11390

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❌ 2 New Failures

As of commit 4f4dc6e with merge base b4bd556 ():

NEW FAILURES - The following jobs have failed:

• Lint / lintrunner / linux-job (gh)
  >>> Lint for runtime/backend/backend_update_context.h:
• pull / test-llama-runner-linux (fp32, xnnpack+quantize_kv, linux.2xlarge, executorch-ubuntu-22.04-clang12) / linux-job (gh)
  RuntimeError: Command docker exec -t a6380aec20de163b254834d0b27de9512e776e5b6942a452e65dbfc6fdc8fa7d /exec failed with exit code 1

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This pull request was exported from Phabricator. Differential Revision: D75919212