Track htmx v2 - htmxor should support v2

[egil]

While there is only an alpha release of htmx, it makes sense that htmxor supports it. Depending on htmx release cadance, it may even be the default.

https://v2-0v2-0.htmx.org/migration-guide-htmx-1/

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These are changes that likely impact htmxor directly:

• [ ] htmx now includes head tag merging functionality out of the box
• [ ] Attribute inheritance can now be disabled entirely via the htmx.config.disableInheritance config variable
• [ ] Response code handling is now configurable via the htmx.config.responseHandling config variable
• [ ] DELETE requests now use parameters, rather than form encoded bodies, for their payload (This is in accordance w/ the spec.)

[egil]

Code for passing response handling in htmxconfig:

public partial record HtmxConfig
{
    [JsonPropertyName("responseHandling")]
    public IList<ResponseHandlingRule>? ResponseHandling { get; set; }
}

public record class ResponseHandlingRule
{
    public required string Code { get; set; }

    public bool Swap { get; set; }

    public bool? Error { get; set; }

    public bool? IgnoreTitle { get; set; }

    public string? Select { get; set; }

    public string? Target { get; set; }

    public string? SwapOverride { get; set; }
}

[egil]

New swap style:

public enum SwapStyle
{
    /// <summary>
    /// Replace the text content of the target element, without parsing the response as HTML.
    /// </summary>
    /// <remarks>
    /// NOTE: Available in Htmx version 2 and later.
    /// </remarks>
    TextContent
}