refactor: move the `halo2_common::arithmetic` to `halo2_backend`(post fe-be split) #554

	name: Stable lints

	# We only run these lints on trial-merges of PRs to reduce noise.
	on: pull_request

	jobs:
	clippy:
	name: Clippy (1.56.1)
	timeout-minutes: 30
	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v3
	- uses: actions-rs/toolchain@v1
	with:
	components: clippy
	override: false
	- name: Run clippy
	uses: actions-rs/clippy-check@v1
	with:
	name: Clippy (1.56.1)
	token: ${{ secrets.GITHUB_TOKEN }}
	args: --all-features --all-targets -- -D warnings

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