feature #21158 [Uid] Add microsecond precision to UUIDv7 and optimize on x64 (alamirault)

This PR was squashed before being merged into the 7.4 branch.

Discussion
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[Uid] Add microsecond precision to UUIDv7 and optimize on x64

Fix #21143

Commits
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a3c4299 [Uid] Add microsecond precision to UUIDv7 and optimize on x64

Author: OskarStark

components/uid.rst

@@ -120,7 +120,7 @@ sortable (like :ref:`ULIDs <ulid>`). It's more efficient for database indexing
 **UUID v7** (UNIX timestamp)
 
 Generates time-ordered UUIDs based on a high-resolution Unix Epoch timestamp
-source (the number of milliseconds since midnight 1 Jan 1970 UTC, leap seconds excluded)
+source (the number of microseconds since midnight 1 Jan 1970 UTC, leap seconds excluded)
 (`read the UUIDv7 spec <https://datatracker.ietf.org/doc/html/draft-ietf-uuidrev-rfc4122bis#name-uuid-version-7>`__).
 It's recommended to use this version over UUIDv1 and UUIDv6 because it provides
 better entropy (and a more strict chronological order of UUID generation)::
@@ -130,6 +130,10 @@ better entropy (and a more strict chronological order of UUID generation)::
     $uuid = Uuid::v7();
     // $uuid is an instance of Symfony\Component\Uid\UuidV7
 
+.. versionadded:: 7.4
+
+    In Symfony 7.4, the precision was increased from milliseconds to microseconds.
+
 **UUID v8** (custom)
 
 Provides an RFC-compatible format intended for experimental or vendor-specific use cases