Add await and Protocol to the identifiers escaping rules

[denil-ct]

Motivation

Resolves #34

Modifications

• Added Protocol to the keywords set.
• Added await to the keywords set.

Result

• Would be able to support Protocol and await as property names.

Test Plan

Tested and verified for both names. They are properly renamed to _Protocol and _await

[czechboy0]

Hi @denil-ct, thanks for another contribution!

Adding the two keywords is the quick fix and covers the original issue, so let's keep this PR to just that change, and please add to the unit tests to have some automated testing.

Could you break out the hex encoding experiment into a separate PR? I'd like us to discuss it more, but I don't want to block fixing #34 for it. Thanks! 🙏

[denil-ct]

Sure, that makes sense.
Quick question @czechboy0 , the initial issue mentions only the Protocol keyword. Should there be a new issue for await or can it be added on to that?

[czechboy0]

You can add await as well in this PR, the change is well understood.

The hex stuff is new and we'll want to think about the implications to existing code etc, thus the separate PR.

[czechboy0]

@swift-server-bot add to allowlist

[czechboy0]

Looks good, thanks! I checked the unit tests and we already cover the "keyword" case, so no real need to list all the keywords there.

[simonjbeaumont]

@denil-ct thank you for once again for diving in 💪

I left a comment about Protocol—not sure if we need it.

Additionally, would you mind adopting a PR title that would make a good entry in the release notes. For this PR, something like:

Add `await` to the identifiers escaping rules