Rust

Introduce the `Env::nested_read_txn` from an `RwTxn` #456

Job	Run time
Ensure clippy is happy on heed and heed3	21s
Check all the features of the heed3 project (ubuntu-latest)	16s
Check the heed3 project (ubuntu-latest)	32s
Check all the features of the heed project (ubuntu-latest)	50s
Check all the features of the heed3 project (macos-latest)	32s
Check the heed3 project (windows-latest)	1m 6s
Check all the features of the heed project (macos-latest)	28s
Run the heed examples (ubuntu-latest)	1m 7s
Check the heed3 project (macos-latest)	21s
Run the heed examples (macos-latest)	26s
Ensure the heed and heed3 project are formatted	12s
Run the heed3 examples (ubuntu-latest)	29s
Run the heed3 examples (macos-latest)	25s
Test the heed3 project (ubuntu-latest)	43s
Test the heed project (ubuntu-latest)	45s
Ensure heed3 is not erasing heed	4s
Test the heed3 project (windows-latest)	47s
Test the heed project (windows-latest)	47s
Test the heed3 project (macos-latest)	33s
Test the heed project (macos-latest)	32s
	11m 16s

Provide feedback