DomainRuleNode in ContainsSubtree

[Whebon]

Contributions:

• Add constructor for DomainRuleNode
• Add DomainRuleNode for ContainsSubtree
• Bug fixes related to an edge case in forbidden sequence

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 85.71429% with 5 lines in your changes missing coverage. Please review.

Project coverage is 75.25%. Comparing base (c91af15) to head (8d7712d).

Files	Patch %	Lines
src/makeequal.jl	77.27%	5 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #58 +/- ## ========================================== + Coverage 74.48% 75.25% +0.77% ========================================== Files 31 31 Lines 1352 1382 +30 ========================================== + Hits 1007 1040 +33 + Misses 345 342 -3 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.