feat: Support theming and translations via config files

[phated]

This implements theming and translation support via the .gulp.js config files. If a user supplies a message function in their config file, we will call it with various message symbols and extra data. The user can return the message they want to print, return false explicitly to silence the message, or do nothing to fallback to the gulp-cli default message.

Since anything logged via gulplog will pass through this mechanism, users can also intercept string messages from plugins and return something different.

Users can also override the timestamp we print by providing a timestamp function in their config file.

Closes #63
Closes #177
Closes #206
Closes #161 (replaces it)

[phated]

This will become the new module so users can install it for usage in their .gulp.js files.

[phated]

@sttk this is ready for review. Please take a look! I've updated the top comment to describe the feature and updated tests, etc. Thank you for all of the amazing work that I used for the basis of these changes 🙇 ❤️

When we finalize this, I will put together the @gulpjs/messages package and update all of the TODOs.

[sttk]

@phated I have replied to your comments. Have a look them.

[phated]

@sttk please review again now that I've addressed all your comments.

[phated]

@sttk I've address the comments and added documentation. Can you provide a final review so I can make the @gulpjs/messages package and finish this PR in the next 3 days? 🙏

[sttk]

@phated I have added this comment, so please take a look. Otherwise, I think everything is good.

[phated]

@sttk Thank you for the thorough review! I am going to create the @gulpjs/messages package and then update this PR to use it before merging.