feat(config): allow the configuration of filename modifiers

[ffknob]

Description

Just a tweak I've came up with. I work in some Java projects in which my files are stored deeply in the directories structure. When triggering the buffers UI in my Lazyvim (<leader>b) I'm not able to see the filename because it is hidden by the UI's width limitation.

I discovered that the filename used in the buffers list is actually defined through the fnamemodify() Vim function, which takes a string as argument with some pattern that will convert the full path of the file in many ways, including just the filename, which is what I prefer.

The PR changes the defaults config object so a new filename_modifier parameter could be set by the user. This value will then be used in the bufname() function, keeping the current ":~:." pattern as a default.

After changing the plugin's code I'm now able to have the following config customization file in my Lazyvim:

{
    "folke/which-key.nvim",
    opts = { filename_modifier = ":t." },
  },
}

Now instead of having this in my buffers menu...

0 src/main/java/br/rs/gov/
1 src/main/java/br/rs/gov/
2 src/main/java/br/rs/gov/
...

...I can easily identify the buffers by its names:

0 FileA.java
1 FileB.java
2 FileC.java
...

I don't know if there was another easier way to achieve the same thing, just went ahead with this tweak and it'sworking for me.

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