feat: expand nonce to 128-bit

[zhangsoledad]

breaking change

• expand nonce to 128-bit
• change pow_message from [nonce + pow_hash] to [pow_hash + nonce ]

[nervos-bot]

Hold as requested by @zhangsoledad.

[zhangsoledad]

nervosnetwork/ckb-system-scripts#52

Unhold as requested by @zhangsoledad.

[driftluo]

let num = 200u128;

[zhangsoledad]

this doesn't help,
these tests will also take the num as BlockNumber, cast can't be avoided.

fn insert_block(
        chain_controller: &ChainController,
        shared: &Shared,
        nonce: u128,
        number: BlockNumber,
) 

[doitian]

bors r+

[bors]

Build succeeded

• continuous-integration/travis-ci/push

[backporting]

The backport to rc/v0.22 failed:

Commits ["017afeacdbfddad8dfda2650cd543e74c7ab9d7c","62eaab7bed92987357a62c6c0e4f75534b57e20f"] could not be cherry-picked on top of rc/v0.22

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub.
git fetch
# Create new working tree.
git worktree add .worktrees/backport rc/v0.22
# Navigate to the new directory.
cd .worktrees/backport
# Cherry-pick all the commits of this pull request and resolve the likely conflicts.
git cherry-pick 017afeacdbfddad8dfda2650cd543e74c7ab9d7c 62eaab7bed92987357a62c6c0e4f75534b57e20f
# Create a new branch with these backported commits.
git checkout -b backport-1666-to-rc/v0.22
# Push it to GitHub.
git push --set-upstream origin backport-1666-to-rc/v0.22
# Go back to the original working tree.
cd ../..
# Delete the working tree.
git worktree remove .worktrees/backport

Then, create a pull request where the base branch is rc/v0.22 and the compare/head branch is backport-1666-to-rc/v0.22.