[11.x] Implement HasV7Uuids to use with MariaDB native uuid data type

[Karem-sobhy]

This PR addresses issue #51883. The referenced issue points out that the uuid data type in MariaDB has problems with orderedUuid, which is used by the HasUuid trait.

MariaDB's documentation suggests using uuid1 or UUID versions >= 6 as a better option.

With this PR, Laravel developers can better utilize their MariaDB UUID columns in terms of performance, indexing, ordering, and storage. Using UUID v7 instead of the ordered UUID v4 currently used by Laravel will:

• Fix the incorrect order bug in MariaDB.
• Improve performance during insertion.
• Align with the standard method of ordering UUIDs by using a truly ordered UUID version instead of simulating one.

Additionally, this PR introduces a new uuid7 helper method in Str.

If this PR is merged, necessary edits to the documentation will be required to guide users on using this trait with MariaDB instead of HasUuid.

[antonkomarev]

I think this could be solved on attribute casts level

[Karem-sobhy]

I think this could be solved on attribute casts level

@antonkomarev can you please give example on how to do this? I tried to make something like the old HasUuid implementation

[staudenmeir]

As discussed in #51883, this PR is then also the base for our plan to switch the HasUuid trait to UUID v7 by default in Laravel 12. This is related to the reverted #44210 but would address its privacy concerns.