Breaking: Remove async message feature

[SBoudrias]

Planning to remove built-in support for async/functions message.

The reasons are kinda simple:

1. I don't want to new Inquirer to be a state/flow management library (that's better done elsewhere; usually with simple Node/JS built-in)
2. The UX is bad; and not been a priority to handle due to point 1
3. When starting the rewrite, I had a few more wrapped logic there, but it was slowly all removed to be inside each prompts. So only message is left, and shows how it didn't match the design goals of the new API.

Do let me know if you think otherwise. I'll leave this PR open for now and bundle with some other breaking changes.

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (2257e58) 94.48% compared to head (b0c122e) 94.44%.
Report is 1 commits behind head on release-v2.

Files	Patch %	Lines
packages/editor/src/index.mts	0.00%	3 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff               @@
##           release-v2    #1322      +/-   ##
==============================================
- Coverage       94.48%   94.44%   -0.04%     
==============================================
  Files              51       51              
  Lines            4457     4426      -31     
  Branches          776      772       -4     
==============================================
- Hits             4211     4180      -31     
  Misses            241      241              
  Partials            5        5              

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