feature: Configuration option to override the usage of timeoutlen

[s1n7ax]

Did you check the docs?

• I have read all the which-key.nvim docs

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

timeoutlen really doesn't defines the purpose of the property clearly in neovim. So when multiple plugins are using the same global value to do two separate things, there is no option except to find the middle ground for both.

Ex:-
Oil.nvim uses timeoutlen to delay the update of effects like toggle hidden files/directories. Which-key is using timeoutlen to delay the popup window.

If what the user wants is to show the oil.nvim to act immediately at the same time which-key to delay the window by 1000ms, then this is not possible.

Describe the solution you'd like

Accept timeout option from the configuration. Fallback to timeoutlen if it's not available or set a default timeout value.

timeout = timeout or vim.o.timeoutlen

OR

timeout = timeout or 500

Describe alternatives you've considered

I think the timeoutlen is a global option so I could not find a solution other than set it to 1000 and hope I don't have to toggle hidden as much in oil.nvim.

Additional context

[github-actions]

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