Rust

Introduce `AnyTls` #497

Job	Run time
Check all the features of the heed project	35s
Check the heed3 project (ubuntu-latest)	19s
Check all the features of the heed3 project	28s
Ensure clippy is happy on heed and heed3	33s
Check the heed3 project (windows-latest)	2m 17s
Check the heed3 project (macos-latest)	37s
Ensure the heed and heed3 project are formatted	12s
Run the heed examples (ubuntu-latest)	26s
Run the heed examples (macos-latest)	38s
Run the heed3 examples (ubuntu-latest)	24s
Run the heed3 examples (macos-latest)	48s
Test the heed3 project (ubuntu-latest)	41s
Test the heed project (ubuntu-latest)	38s
Test the heed3 project (windows-latest)	4m 8s
Ensure heed3 is not erasing heed	2s
Test the heed project (windows-latest)	3m 25s
Test the heed project (macos-latest)	47s
Test the heed3 project (macos-latest)	54s
	17m 52s

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