Add more aliases for Unicode confusable chars

[xen0n]

Building upon #29837, this PR:

• added aliases for space characters,
• distinguished square brackets from parens, and
• added common CJK punctuation characters as aliases.

This will especially help CJK users who may have forgotten to switch off IME when coding.

[rust-highfive]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @pnkfelix (or someone else) soon.

If any changes to this PR are deemed necessary, please add them as extra commits. This ensures that the reviewer can see what has changed since they last reviewed the code. Due to the way GitHub handles out-of-date commits, this should also make it reasonably obvious what issues have or haven't been addressed. Large or tricky changes may require several passes of review and changes.

Please see the contribution instructions for more information.

[nagisa]

I guess I’ll r+ this.

@bors r+

---

Sorry for the delay!

[bors]

📌 Commit 496081c has been approved by nagisa

[bors]

💡 This pull request was already approved, no need to approve it again.

• There's another pull request that is currently being tested, blocking this pull request: Rollup of 14 pull requests #33376

[bors]

📌 Commit 496081c has been approved by nagisa

[bors]

⌛ Testing commit 496081c with merge ff9cf47...

[bors]

💔 Test failed - auto-mac-64-opt-rustbuild

[nagisa]

@bors retry

[alexcrichton]

Spurious because of #33391

[bors]

⚡ Previous build results for auto-linux-32-nopt-t, auto-linux-32cross-opt, auto-linux-64-cargotest, auto-linux-64-cross-armhf, auto-linux-64-cross-armsf, auto-linux-64-cross-freebsd, auto-linux-64-cross-netbsd, auto-linux-64-debug-opt, auto-linux-64-nopt-t, auto-linux-64-opt, auto-linux-64-opt-rustbuild, auto-linux-64-x-android-t, auto-linux-cross-opt, auto-linux-musl-64-opt, auto-mac-64-nopt-t, auto-mac-cross-ios-opt, auto-win-gnu-32-opt-rustbuild, auto-win-msvc-32-cross-opt, auto-win-msvc-64-cargotest, auto-win-msvc-64-opt-rustbuild are reusable. Rebuilding only auto-linux-32-opt, auto-linux-64-opt-mir, auto-mac-32-opt, auto-mac-64-opt, auto-mac-64-opt-rustbuild, auto-win-gnu-32-nopt-t, auto-win-gnu-32-opt, auto-win-gnu-64-nopt-t, auto-win-gnu-64-opt, auto-win-msvc-32-opt, auto-win-msvc-64-opt, auto-win-msvc-64-opt-mir...

[alexcrichton]

@bors: retry force clean

[alexcrichton]

@bors: retry force clean

[bors]

⌛ Testing commit 496081c with merge 413bafd...

[bors]

☀️ Test successful - auto-linux-32-nopt-t, auto-linux-32-opt, auto-linux-32cross-opt, auto-linux-64-cargotest, auto-linux-64-cross-armhf, auto-linux-64-cross-armsf, auto-linux-64-cross-freebsd, auto-linux-64-cross-netbsd, auto-linux-64-debug-opt, auto-linux-64-nopt-t, auto-linux-64-opt, auto-linux-64-opt-mir, auto-linux-64-opt-rustbuild, auto-linux-64-x-android-t, auto-linux-cross-opt, auto-linux-musl-64-opt, auto-mac-32-opt, auto-mac-64-nopt-t, auto-mac-64-opt, auto-mac-64-opt-rustbuild, auto-mac-cross-ios-opt, auto-win-gnu-32-nopt-t, auto-win-gnu-32-opt, auto-win-gnu-32-opt-rustbuild, auto-win-gnu-64-nopt-t, auto-win-gnu-64-opt, auto-win-msvc-32-cross-opt, auto-win-msvc-32-opt, auto-win-msvc-64-cargotest, auto-win-msvc-64-opt, auto-win-msvc-64-opt-mir, auto-win-msvc-64-opt-rustbuild