add status label on findbar and replacebar

[Fozei]

It is convent to know how many result they have and which step they are on when the users do searching or replacing operations.

Like VS Code or other text editor do.

And more ,I want to known which IDE are you using for develop deepin-apps, it is very hard for me to code this project by vscode and the Qt Creator seems have different UI when I build from it.

[github-actions]

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[deepin-ci-robot]

Hi @Fozei. Thanks for your PR.

I'm waiting for a linuxdeepin member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[Fozei]

I have read the CLA Document and I hereby sign the CLA.