add support for converting to WKT to EPSG #582

Job	Run time
Documentation	5m 48s
Julia 1.6 - ubuntu-latest - x64 - pull_request	4m 18s
Julia 1.6 - macOS-latest - x64 - pull_request	5m 16s
Julia 1.6 - windows-latest - x64 - pull_request	13m 8s
Julia 1 - ubuntu-latest - x64 - pull_request	6m 13s
Julia 1 - macOS-latest - x64 - pull_request	6m 24s
Julia 1 - windows-latest - x64 - pull_request	7m 34s
Julia nightly - ubuntu-latest - x64 - pull_request	3m 44s
Julia nightly - macOS-latest - x64 - pull_request	5m 10s
Julia nightly - windows-latest - x64 - pull_request	6m 58s
	1h 4m 33s

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