[mini.ai] subword textobject

[qtyra]

Based on https://github.com/echasnovski/mini.ai/blob/main/doc/mini-ai.txt#L341, it works with camelCase, snake_case and uppercase snake_case, it would be cool to support the 'around' part like nvim-various-textobjects but i failed to implemented it, anyways this works fairly well for me.

custom_textobjects = {
    e = {
        {
            "%u[%l%d]+%f[^%l%d]",
            "%f[%S][%l%d]+%f[^%l%d]",
            "%f[%P][%l%d]+%f[^%l%d]",
            "^[%l%d]+%f[^%l%d]",
            "%f[%S][%w]+%f[^%w]",
            "%f[%P][%w]+%f[^%w]",
            "^%w+%f[^%w]",
        },
        "^().*()$",
    },
}