use a bit vector to represent edge types

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 91.34615% with 9 lines in your changes are missing coverage. Please review.

Project coverage is 80.94%. Comparing base (155fb4a) to head (ff68a44).

Files	Patch %	Lines
src/util/mermaid/dfg.ts	73.68%	3 Missing and 2 partials :warning:
src/core/print/dataflow-printer.ts	50.00%	2 Missing :warning:
src/dataflow/graph/diff.ts	90.90%	0 Missing and 1 partial :warning:
...low/internal/process/functions/process-argument.ts	0.00%	0 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #779 +/- ## ========================================== + Coverage 80.74% 80.94% +0.20% ========================================== Files 163 163 Lines 4710 4728 +18 Branches 856 787 -69 ========================================== + Hits 3803 3827 +24 + Misses 634 631 -3 + Partials 273 270 -3 ```

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[EagleoutIce]

This pull request is included in v2.0.0 (see Release v2.0.0 (Dataflow v2)).

[EagleoutIce]

This pull request is included in v2.0.0 (see Release v2.0.0 (Dataflow v2)).