Add a function knorm_elliptic (#909) #1654

Job	Run time
Julia 1.6 - ubuntu-latest - x64 - push	7m 11s
Julia 1.6 - macos-latest - x64 - push	6m 39s
Julia 1.6 - windows-latest - x64 - push	15m 44s
Julia 1 - ubuntu-latest - x64 - push	11m 54s
Julia 1 - macos-latest - x64 - push	11m 3s
Julia 1 - windows-latest - x64 - push	12m 28s
Julia 1 - macos-latest - arm64 - push	6m 31s
Julia nightly - ubuntu-latest - x64 - push	11m 27s
Julia nightly - macos-latest - x64 - push	9m 53s
Julia nightly - windows-latest - x64 - push	11m 16s
	1h 44m 6s

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