feat: add config option to enable jit-in-time debugging

This option tells flow to start gdbserver and pause the process waiting for
gdb to connect when a crash happens.

src/config.zig

@@ -27,6 +27,8 @@ bottom_bar: []const u8 = "mode file log selection diagnostics keybind linenumber
 show_scrollbars: bool = true,
 show_fileicons: bool = true,
 
+start_debugger_on_crash: bool = false,
+
 include_files: []const u8 = "",
 
 pub const DigitStyle = enum {

src/tui/tui.zig

@@ -103,6 +103,9 @@ fn init(allocator: Allocator) InitError!*Self {
     var conf, const conf_bufs = root.read_config(@import("config"), allocator);
     defer root.free_config(allocator, conf_bufs);
 
+    if (conf.start_debugger_on_crash)
+        tp.install_debugger();
+
     const theme_, const parsed_theme = get_theme_by_name(allocator, conf.theme) orelse get_theme_by_name(allocator, "dark_modern") orelse return error.UnknownTheme;
     conf.theme = theme_.name;
     conf.whitespace_mode = try allocator.dupe(u8, conf.whitespace_mode);