Rust

Introduce `AnyTls` #503

Job	Run time
Check all the features of the heed project	1m 38s
Ensure clippy is happy on heed and heed3	23s
Check all the features of the heed3 project	31s
Check the heed3 project (ubuntu-latest)	21s
Run the heed examples (ubuntu-latest)	29s
Check the heed3 project (windows-latest)	3m 4s
Ensure the heed and heed3 project are formatted	11s
Check the heed3 project (macos-latest)	28s
Run the heed3 examples (ubuntu-latest)	38s
Run the heed examples (macos-latest)	27s
Run the heed3 examples (macos-latest)	46s
Test the heed3 project (ubuntu-latest)	39s
Ensure heed3 is not erasing heed	4s
Test the heed3 project (windows-latest)	31s
Test the heed project (ubuntu-latest)	38s
Test the heed3 project (macos-latest)	30s
Test the heed project (windows-latest)	2m 32s
Test the heed project (macos-latest)	53s
	14m 43s

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