feat: tmux shell integration

[hehaoqian]

issue: #233074

shell integration support for tmux.

Currently, only bash inside tmux is supported.
zsh and fish will take more time because I don't usually use those shell

Usage of tmux shell integration:

1. tmux must be started directly from the terminal of tmux. Click the "+" button in the top right of terminal pane, click "tmux".
   It should NOT be started indirectly from a bash shell
2. Shell integration needs to manually enabled in tmux. Similar to what described in https://code.visualstudio.com/docs/terminal/shell-integration#_manual-installation,
   but environment variable TERM_PROGRAM will be set to tmux by tmux, instead of vscode,
   therefore, in ~/.bashrc I uses environment variable VSCODE_IPC_HOOK_CLI to determine if the terminal is vscode

# Add the following lines to ~/.bashrc
if [[ -n "VSCODE_IPC_HOOK_CLI" ]]; then
  . "$(code --locate-shell-integration-path bash)"
fi

Supported features:

✅ Run recent command
✅ Go to recent directory
✅ Current working directory detection

Unsupported features (HELP NEEDED):

❌ Command decorations and the overview ruler
❌ Command navigation
❌ Sticky scroll
❌ Quick fixes

My current implementation does not work for "Command decorations",
so I have to discard the output of __vsc_prompt_start/__vsc_prompt_end,
otherwise the prompt render will be broken.
Help needed how to solve this issue

[hehaoqian]

@microsoft-github-policy-service agree

[hehaoqian]

@Tyriar Can you have a look on my code, and give me some hint the way to support command decoration?
that is, remove the temporary workaround I added in __vsc_update_prompt

You can have a try with tmux terminal and see what happens if all added code in __vsc_update_prompt are removed.

My OS is WSL (ubuntu 22.04.4) with tmux 3.2a
VSCode is 1.95.2

I do not understand how the script works in order to support this feature.