Missing IPTC tags added in recent spec adjustments

[fydar]

Prerequisites

• I have written a descriptive issue title
• I have verified that I am running the latest version of ImageSharp
• I have verified if the problem exist in both DEBUG and RELEASE mode
• I have searched open and closed issues to ensure it has not already been reported

ImageSharp version

3.1.10

Other ImageSharp packages and versions

None

Environment (Operating system, version and so on)

n/a

.NET Framework version

n/a

Description

I've noticed that there are some IPTC metadata tags (represented by the enum IptcTag) which have been added to the specification since support was added for IPTC metadata tags back in 2020.

For example, this one added in 2021 for alt text.
https://iptc.org/std/photometadata/specification/IPTC-PhotoMetadata#alt-text-accessibility

And this one added in 2023 for Data Mining.
https://iptc.org/std/photometadata/specification/IPTC-PhotoMetadata#data-mining

I'm personally interested in modifying the Data Mining tag to disallow AI training on content that I host.

Steps to Reproduce

1. Observe IptcTag has missing values.

Images

No response