[Feature]: per-mode implementations for functions (funcs)

[hinell]

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Description

Very similiar to, but for functions:

• https://github.com/mrjones2014/legendary.nvim/issues/215

Can we have the same feature for legendary.funcs(...)?

There are functions, that can only be run in visual mode, so it's logical to have { mode = {...} } restrictions so upon running :Legendary we have these funcs filtered...

endary.funcs({
	{ mode = { "v" }, description = "Buffer: my fn in visual mode" , fn }
})