Use qualified graph for inferring .d.ts files

[kevinbarabash]

• Get the first few .d.ts files working
• Get all previously working .d.ts (except lib.dom.d.ts) working again)

NOTE: There's still an issue with inferring lib.dom.d.ts. I'm going to address that in a separate PR.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 92.20779% with 6 lines in your changes missing coverage. Please review.

Project coverage is 82.36%. Comparing base (5ed57e6) to head (0f2118a).

Files	Patch %	Lines
src/Escalier.TypeChecker/BuildGraph.fs	93.33%	4 Missing :warning:
src/Escalier.TypeChecker/InferGraph.fs	86.66%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #240 +/- ## ========================================== + Coverage 81.76% 82.36% +0.60% ========================================== Files 25 25 Lines 10856 10903 +47 Branches 1566 1574 +8 ========================================== + Hits 8876 8980 +104 + Misses 1980 1923 -57 ```

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