MacOS precision matrix

[quantumsteve]

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Proposed changes

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What type(s) of changes does this code introduce?

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• [ ] Bugfix
• [ ] New feature
• [ ] Code style update (formatting, renaming)
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Build related changes
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Does this introduce a breaking change?

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• [ ] No

What systems has this change been tested on?

Checklist

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• [ ] this PR is up to date with current the current state of 'develop'
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• [ ] this PR adds tests to cover any new code, or to catch a bug that is being fixed
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[quantumsteve]

@stefan-schnake @mkstoyanov The errors in some of these tests look quite large.

-------------------------------------------------------------------------------
time advance - continuity 6 - float
  continuity6, level 2, degree 2, sparse grid
-------------------------------------------------------------------------------
/Users/runner/work/asgard/asgard/src/asgard_time_advance_tests.cpp:420
...............................................................................

/Users/runner/work/asgard/asgard/testing/tests_general.hpp:78: FAILED:
  REQUIRE( (diff_norm / max) < (tolerance * std::sqrt(v0.size())) )
with expansion:
  1.81565344333648681641f < 0.000187678