feature: jump to the first match using a custom key instead of <CR>

[Runeword]

Did you check the docs?

• [X] I have read all the flash.nvim docs

Is your feature request related to a problem? Please describe.

I press <Tab> to jump, then <CR> to jump to the first match. Those are different keys and therefore not the most convenient.

Describe the solution you'd like

I would like to use <Tab> to jump, then <Tab> again to jump to the first match.

Describe alternatives you've considered

Use the default key <CR>

Additional context

No response