(Closes #2624) Add FortranWriter().schedule_node().

[JulienRemy]

Avoids defaulting to str(schedule) for Schedule().debug_string() and raising a VisitorError using FortranWriter()(Schedule()).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.88%. Comparing base (130eac0) to head (7b07110).
Report is 8 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2628   +/-   ##
=======================================
  Coverage   99.88%   99.88%           
=======================================
  Files         357      357           
  Lines       49708    49724   +16     
=======================================
+ Hits        49652    49668   +16     
  Misses         56       56           

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[JulienRemy]

@sergisiso This is a very minor feature but it's proven convenient at times. It should now be ready to merge if you want.

[sergisiso]

Thanks @JulienRemy, this is a small PR that improves our debug_string capabilities, all checks are green. This is approved for merging.

Apologies that this was not reviewer earlier, in the future remember to put the "Ready for Review" label so I can see it marked on the list of PRs.

[sergisiso]

Waiting for #2775 for get merged