Refactor `RefElemData` #944

Job	Run time
Julia 1.10 - ubuntu-latest - x64 - pull_request	5m 52s
Julia 1 - ubuntu-latest - x64 - pull_request	6m 1s
Julia nightly - ubuntu-latest - x64 - pull_request	9m 22s
Documentation	1m 31s
Julia 1 - macOS-latest - x64 - pull_request	7m 41s
Julia 1 - windows-latest - x64 - pull_request	8m 45s
	39m 12s

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