Add kitty keyboard protocol support to Unix _pyrepl

[jechol]

Summary

VS Code 1.109 rolled out kitty keyboard protocol support in the integrated terminal via terminal.integrated.enableKittyKeyboardProtocol. Once enabled, the program running in the terminal needs to request and understand the protocol itself. _pyrepl currently does not, which breaks the Unix/macOS Python REPL when keys start arriving as kitty keyboard sequences instead of legacy terminal input.

This PR fixes that by teaching Unix _pyrepl to participate in the protocol and translate kitty key reports back into the existing _pyrepl event model.

• enable kitty keyboard protocol when Unix _pyrepl prepares the terminal and restore the previous keyboard mode on exit
• parse kitty CSI u, CSI ~, and CSI 1;... key reports in unix_eventqueue and translate them into existing _pyrepl key events
• add regression tests for kitty key parsing and update REPL output sanitizing for the new terminal control sequences

Tests

• ./python.exe -m test -j1 test_pyrepl.test_eventqueue test_pyrepl.test_unix_console
• ./python.exe -m test -j1 test_pyrepl.test_pyrepl

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