Add TinyMatrix's double-dot product

Also add a bunch of non discard qualifiers for TinyMatrix and TinyVector and forbids Frobenius norm for non floating point TinyMatrix

enabled an automatic merge when all merge checks for e143dd35 pass

aborted the automatic merge because the source branch was updated. Learn more.

added 1 commit

• 2700ce54 - Fix unit tests

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mentioned in commit 952ea01b

merged