Add roundtrip integration test

Merged Jørgen Lind requested to merge feature/jorgen.lind/roundtrip_test into master

if cmake parameters TEST_SEGY_FILE and TEST_URL with optional TEST_CONNECTION then the test will used said parameters import the SEGY file with default parameters, and then export the VDS to a local SEGY file. It will then do a SHA256 hash of both files and validate that the hashes er the same.

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