Rename CTC NodeFlags and EdgeFlags

[msschwartz21]

Prefixes ctc specific flags with "CTC_". This will allow us to isolate the CTC specific annotations and in the future create our own set of edge and node annotations.

Types of Changes

What types of changes does your code introduce? Delete those that do not apply.

• Bugfix (non-breaking change which fixes an issue)

Which topics does your change affect? Delete those that do not apply.

• Track Errors
• Core functionality (e.g. TrackingGraph, run_metrics, cli, etc.)

Checklist

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• I have read the developer/contributing docs.
• I have added tests that prove that my feature works in various situations or tests the bugfix (if appropriate).
• I have checked that I maintained or improved code coverage.
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• I have updated the general documentation including Metric descriptions and example notebooks if necessary.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.17%. Comparing base (f748876) to head (7ea7fa2).
Report is 6 commits behind head on track-errors.

Additional details and impacted files

@@               Coverage Diff                @@
##           track-errors     #179      +/-   ##
================================================
+ Coverage         92.83%   93.17%   +0.34%     
================================================
  Files                19       19              
  Lines               879      879              
================================================
+ Hits                816      819       +3     
+ Misses               63       60       -3     

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