chore: Rename generators to coroutines

[tibordp]

Also allow coroutines to receive values from outside.

[codecov]

Codecov Report

Attention: Patch coverage is 98.87640% with 1 line in your changes missing coverage. Please review.

Project coverage is 88.94%. Comparing base (b616323) to head (3b950ca).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/alumina-boot/src/ir/mono.rs	98.71%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #107   +/-   ##
=======================================
  Coverage   88.94%   88.94%           
=======================================
  Files          35       35           
  Lines       16553    16565   +12     
=======================================
+ Hits        14723    14734   +11     
- Misses       1830     1831    +1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.