Add breakOnSystemExit setting to launch/attach configuration schema

[rchiodo]

Exposes debugpy's new breakOnSystemExit option (microsoft/debugpy#2017) in the extension's launch.json / attach configuration schema, as requested in microsoft/debugpy#1591.

What

• Adds the breakOnSystemExit attribute to both the launch and attach configurationAttributes in package.json (IntelliSense + validation in launch.json).
• Adds the matching breakOnSystemExit?: (number | SystemExitRange)[] field and SystemExitRange type to ICommonDebugArguments in src/extension/types.ts.

Behavior

breakOnSystemExit accepts an array of exit codes and/or inclusive { "from", "to" } ranges, controlling which SystemExit codes cause the debugger to break:

• [] — never break on SystemExit
• [1, 2] — break only on codes 1 and 2
• [{ "from": 3, "to": 100 }] — break on codes 3-100 (inclusive)
• omitted — debugpy's existing default behavior (break on all non-zero exit codes, ignoring successful exits)

The value is passed straight through to debugpy, which parses it; no config-resolver changes are required.

Testing

• tsc --noEmit passes with no errors.
• package.json validated as well-formed JSON.