use py310 style union annotations

[seeM]

This changes eval_types to parse |-separated string annotations to Unions instead of tuples, which (1) fixes @patch and @typedispatch when using py310 style union annotations in Python 3.10 without importing future annotations, and (2) is required by #415. It is still compatible with the tuple style.

It also changes all tuple style annotations to py310 style. I found these using ripgrep with rg --multiline -t jupyter -t py '\([^\(\)]*:\s*\(.*'.

cc @hamelsmu @jph00

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[seeM]

@jph00 this is ready for review. This changes eval_types to parse |-separated string annotations to Unions instead of tuples, which (1) fixes @patch and @typedispatch when using py310 style union annotations in Python 3.10 without importing future annotations, and (2) is required by #415. It is still compatible with the tuple style.

It also changes all tuple style annotations to py310 style. I found these using ripgrep with rg --multiline -t jupyter -t py '\([^\(\)]*:\s*\(.*'.

[jph00]

Thank you!