Rust

Introduce `AnyTls` #501

Job	Run time
Check all the features of the heed project	34s
Check all the features of the heed3 project	1m 58s
Ensure clippy is happy on heed and heed3	25s
Check the heed3 project (ubuntu-latest)	47s
Check the heed3 project (windows-latest)	2m 0s
Check the heed3 project (macos-latest)	22s
Run the heed examples (ubuntu-latest)	30s
Ensure the heed and heed3 project are formatted	12s
Run the heed3 examples (ubuntu-latest)	53s
Run the heed examples (macos-latest)	47s
Run the heed3 examples (macos-latest)	32s
Test the heed3 project (ubuntu-latest)	47s
Test the heed3 project (windows-latest)	3m 10s
Test the heed project (ubuntu-latest)	48s
Test the heed3 project (macos-latest)	50s
Ensure heed3 is not erasing heed	2s
Test the heed project (windows-latest)	2m 50s
Test the heed project (macos-latest)	45s
	18m 12s

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