Small speed related changes

[munrojm]

• Ensure summary endpoint hint is ordered properly
• Max length for element list query added

[codecov-commenter]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (2e2ae4d) 90.84% compared to head (8f42220) 89.19%.

Files	Patch %	Lines
.../emmet/api/routes/materials/summary/hint_scheme.py	77.77%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #910 +/- ## ========================================== - Coverage 90.84% 89.19% -1.66% ========================================== Files 137 107 -30 Lines 12826 9678 -3148 ========================================== - Hits 11652 8632 -3020 + Misses 1174 1046 -128 ```

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