fixes #20603

Part of #18454

Fixes #19026

peekLF and peekSingleByteChar apparently aren't inlined, hurting the perf in this very hot loop. The perf regression is partly from function calls, and partly from the function depending on a closure. It also seems like there might be more gains to be had if I refactor this file to not depend so heavily on closures and nested anonymous functions.

* markdown-it-named-header custom slugify for non-latin characters

* Delete comment

Terminal links

fixes #18672

fixes #20567

Uplevel node-pty@0.6.2

takes up too much vertical space as is. Also change the string to make it less likely to wrap and take another line.

* Add Command to Go To / Create project configuration for an active js or ts file

Part of #20356

Adds a new command that opens the jsconfig or tsconfig project configuration file for the currently active file. If one does not exist, displays a quick pick that allows users to learn more and create a config file at the root of their project

* Add messages for error cases

* Work around ts error

fixes #18654