allow libsql to work with versioned migrations

[golanglemonade]

Issue:

• When using libsql with versioned migrations I would get an "unsupported dialect" error from Ent
• The old libsql driver did not support time.Time

PR Includes:

• Updates the libsql client to the github.com/tursodatabase/libsql-client-go
• Uses the dialect.Sqlite for ent versioned migrations when using libsql driver

This allows the use of the following in migrations:

env "turso" {
  url     = "libsql://<REPLACE WITH YOUR SUBDOMAIN>?authToken=${var.token}"
  exclude = ["_litestream*"]
}

Relates to: #2338

[a8m]

Thanks for the contribution, but I prefer not to mix driver logic with cmdapi.

Drivers can implement their own RevisionsReadWriter, and I need to move this implementation out so the libsql driver one can reuse it.