Ctrl+C (SIGINT) won't be effective on Windows after fleet support on Windows is merged

[cosmo0920]

Bug Report

Describe the bug

After merging fleet management support on Windows, SIGINT won't work on Windows.
This is because ctrl handlers are working on the separated thread from the main thread loop and prioritized handling of the signals on console.
This leads SIGINT won't work on Windows.

To Reproduce

• Steps to reproduce the problem:

1. Run fluent-bit on cmd.exe ore powershell
2. Send SIGINT signal (Press Ctrl+C)
3. Nothing happen 💥

Expected behavior

Printed caught signal (SIGINT) and terminated fluent-bit process.

Screenshots

Your Environment

• Version used: After commit: dff5982
• Configuration: None. Only commandline options should be reproduced this issue.
• Environment name and version (e.g. Kubernetes? What version?): Windows 11
• Server type and version:
• Operating System and version: Windows 11 Pro 22H2
• Filters and plugins:

Additional context