Make uuid1() and uuid7() reproducible under a fixed seed

[vidigoat]

What does this change

uuid1() and uuid7() now derive their timestamp from the seeded Faker generator instead of time.time(), so they return the same value on every run under a fixed seed, matching uuid4(). Adds test_uuid1_seedability and test_uuid7_seedability.

What was wrong

Both methods built their timestamp bits from the wall clock:

• uuid1: nanoseconds = int(time.time() * 1e9)
• uuid7: unix_ts_ms = int(time.time() * 1000) + ...

The wall-clock value dominates the high bits, so the output changes between runs even with a fixed seed. This breaks the seeding guarantee documented in the README ("A Seed produces the same result when the same methods with the same version of faker are called") and contradicts these methods' own docstrings, which state the timestamp is chosen "to ensure seedability". uuid4() is reproducible; uuid1()/uuid7() are not:

import time
from faker import Faker

def draw(m):
    Faker.seed(0)
    return getattr(Faker(), m)()

a1, a7 = draw("uuid1"), draw("uuid7")
time.sleep(2)
b1, b7 = draw("uuid1"), draw("uuid7")
print(a1 == b1, a7 == b7)  # False False on master

How this fixes it

The timestamp is drawn from self.generator.random over a fixed range (up to 2035-01-01 UTC) instead of the wall clock. The RFC 4122 (v1) and RFC 9562 (v7) version/variant bit layout is unchanged, so the generated UUIDs are still structurally valid time-based UUIDs — they are now simply reproducible under a fixed seed. import time is no longer used and is removed.

Fixes #2426

AI Assistance Disclosure (REQUIRED)

• If AI tools were used, I have disclosed which ones, and fully reviewed and verified their output.

I used an AI assistant to help draft this description and cross-check the RFC bit layouts. I reviewed and verified the change myself: reproduced the bug on master, confirmed the two new tests fail before the fix and pass after, and ran the full test suite (2393 passed) plus make lint (isort/black 24.4.0/flake8 clean on the changed files; the pre-existing mypy findings in json() are unrelated).

Checklist

• I have read the documentation about CONTRIBUTING
• I have read the documentation about Coding style
• I have run make lint

[fcurella]

Thank you!