Rust

Add Dup Sort Custom Comparator support #512

Job	Run time
Check all the features of the heed project	33s
Test the heed project (ubuntu-latest)	1m 11s
Test the heed project (windows-latest)	1m 42s
Test the heed project (macos-latest)	37s
Ensure clippy is happy on heed and heed3	38s
Run the heed examples (ubuntu-latest)	42s
Check all the features of the heed3 project	29s
Run the heed examples (macos-latest)	41s
Check the heed3 project (ubuntu-latest)	23s
Check the heed3 project (windows-latest)	2m 11s
Run the heed3 examples (ubuntu-latest)	46s
Check the heed3 project (macos-latest)	29s
Run the heed3 examples (macos-latest)	35s
Test the heed3 project (ubuntu-latest)	59s
Test the heed3 project (windows-latest)	3m 14s
Ensure the heed and heed3 project are formatted	11s
Test the heed3 project (macos-latest)	41s
Ensure heed3 is not erasing heed	3s
	16m 5s

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