feat: add watchdog mechanism for automatic lock renewal

[zenghuasheng]

Unable to Run Tests on macOS Due to tempredis.Start Returning io.EOF

I encountered an issue while running the test suite on macOS. The tests rely on tempredis, and in the redsync_test.go:75 TestMain function, the call to tempredis.Start returns an io.EOF error.

From my understanding, this error seems expected in some scenarios, but I'm not entirely sure if this behavior is specific to macOS or if there might be another underlying issue.

I wasn't able to proceed past this error to run the full test suite locally. I would appreciate any guidance or insights from the maintainers or others who have encountered this issue.

Thank you!

Environment:

• OS: macOS Ventura Version 13.3 (22E252)
• Redis Server: Redis server v=7.0.2 sha=00000000:0 malloc=libc bits=64 build=50ced33b9e26b2a3
• Go Version: go version go1.23.4 darwin/arm64
• Redsync Version: master branch, commit id: b292c9f