Allow Enumerator on :data and :instances

[jschroe212]

This uses the tests that came from first draft PR: #54 (comment)

[jschroe212]

I ran the appraisal tests successfully on ruby 2.7.7 with these changes.

[westonganger]

Ok cool.

We need some more robust tests for this that check it with all options. We could likely do something similar to the kitchen sink tests for enumerator.

Also want to ensure that you manually verify the output of the tests in excel will be output to ./tmp/ folder.

Ideally we could have some automated test checking of XML contents, example

spreadsheet_architect/test/unit/xlsx/general_test.rb

Lines 176 to 192 in a8c3b1e

	doc = parse_axlsx_package(p)
	hyperlinks = doc.css("hyperlinks hyperlink")
	assert_equal 2, hyperlinks.size
	ref = "B1"
	assert_equal ref, hyperlinks[0].attr("ref")
	cell = doc.at("c[r='#{ref}']")
	assert_equal "2", cell.text
	assert_equal "inlineStr", cell.attr("t")
	ref = "B2"
	assert_equal ref, hyperlinks[1].attr("ref")
	cell = doc.at("c[r='#{ref}']")
	assert_equal url, cell.text
	assert_equal "inlineStr", cell.attr("t")