Add a way to create an UUIDv7 for a specific timestamp

[mareek]

Things to keep in mind :

• It's not just making UuidV7Generator.New(DateTime) public
• Most of the time, calls to UuidAdvanced.NewV7FromADateTime (name not final) shouldn't interfere with calls to Uuid.NewSequential and Uuid.NewDatabaseFriendly (see exception below)
• Developers that use this feature by mistake by calling UuidAdvanced.NewV7FromADateTime(DateTime.Now) or something similar should except the same behavior as calling Uuid.NewSequential
• Multiple calls to UuidAdvanced.NewV7FromADateTime with the same timestamp during a reasonably short period of time should produce ordered Uuids

See .NET 9's Guid.CreateVersion7(DateTimeOffset) and #14 for inspiration

[timstokman]

One thing that would be very nice is, besides support for the time component, to also be able to determine the random component. This is pretty important for database queries.

Suppose I have a UUIDv7 Id field. It's indexed/partitioned/sharded based on the Id field. I want to query the database for data for the last day, without creating additional indexes. Then being able to construct a query like this:

SELECT * FROM Id >= lowerBoundry

would be nice, where the random component for the lower boundary is initialised to zero. To support these types of queries initializing the random component to the maximum or minimum value needs to be supported in the API.