[Feature] Add useful utility methods to ModalBuilder

[zobweyt]

Description

This PR adds some useful utility methods to the ModalBuilder.

Now it's very easy to respond and update an existing modal in a command handler within a module like this:

await RespondWithModalAsync<MyModal>("modal_id", builder =>
{
    builder
        .WithTitle("Editing my properties…")
        .UpdateTextInput("name", "New name")
        .UpdateTextInput("timestamp", 1119191606)
        .UpdateTextInput("description", input => 
        {
            input.Style = TextInputStyle.Paragraph;
            input.Value = "New description";
        })
        .RemoveComponent("id");
});

Changes

• Add method to get a component of type. (c73b7c0)
• Add methods to update a component either by using a builder or by directly modifying its value. (8623a0e)
• Add methods to remove a component or components of a certain type. (b1b5fa3)
• Add missing row parameter to the AddTextInput wrapper. (1647b0a)
• Update XML documentation. (a101eaa)
• Reorder properties to follow the coding style. (ae71f17)