Add XMPP URI support (RFC5122)

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Dear @gitlab-org team,

In first, I wish you a Happy New Year 2022!

Can you see for add XMPP URI support? XMPP URI support must be added because there actually a problem, it is detected "mailto".

Examples:

• xmpp:username@domain.tld
• xmpp:username@domain.tld?message
• xmpp:mucroom@domain.tld?join

It is a standard:

• RFC5122: https://tools.ietf.org/html/rfc5122

Can you update it and solves this big bug?

Thanks in advance.