Vulncheck command line should report progress

[hyangah]

There is currently no feedback on what the command is doing.
Consider passing cfg.progress in https://github.com/golang/tools/blob/b2552ef554f216cb7c6b475538301c39fb1571e1/internal/lsp/command.go#L797 to opts.Hooks.Govulncheck, and report progress (at least whether we are loading packages, how many packages were loaded, whether we are checking vulndb, whether we started to call vulncheck API, ...)

As we do this, consider logging the time spent in each step to help debugging the performance.

[gopherbot]

Change https://go.dev/cl/404576 mentions this issue: src/goVulncheck: replace gopls custom command with gopls vulncheck``