ENH: Optional Timezone

[Miksus]

This PR implements custom timezones and custom time measurement function (for testing).

Set the timezone:

from rocketry import Rocketry
import pytz

app = Rocketry(timezone=pytz.timezone("Europe/Helsinki"))

Set the time:

def fix_time(dt):
    "Get new time measurement function"
    start_time = time.time()
    def get_time():
        sec_since_start = time.time() - start_time
        return dt.timestamp() + sec_since_start
    return get_time

app = Rocketry(fime_func=fix_time("2014-04-31 10:00:00"))

Other changes:

• Start, end and runtime are passed as epoch to task log repos
• last_run, last_success etc. are not in the JSON representation of a task anymore due to limitations in Pydantic.

Further Idea

Perhaps in the future we could have something like:

with app.test_time("2022-04-31 10:00:00"):
    app.start()

Not sure.

[codecov-commenter]

Codecov Report

Base: 94.90% // Head: 95.20% // Increases project coverage by +0.29% 🎉

Coverage data is based on head (c9480a9) compared to base (8d3ab8a).
Patch coverage: 98.36% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #147      +/-   ##
==========================================
+ Coverage   94.90%   95.20%   +0.29%     
==========================================
  Files          80       80              
  Lines        4515     4630     +115     
==========================================
+ Hits         4285     4408     +123     
+ Misses        230      222       -8     

Impacted Files	Coverage Δ
rocketry/core/time/utils.py	94.73% <85.71%> (-5.27%)	⬇️
rocketry/session.py	98.17% <97.43%> (+2.28%)	⬆️
rocketry/core/task.py	92.17% <98.64%> (+0.98%)	⬆️
rocketry/conditions/api.py	98.38% <100.00%> (ø)
rocketry/conditions/meta.py	93.87% <100.00%> (-1.68%)	⬇️
rocketry/conditions/scheduler.py	100.00% <100.00%> (ø)
rocketry/conditions/task/task.py	93.87% <100.00%> (ø)
rocketry/conditions/task/utils.py	90.12% <100.00%> (ø)
rocketry/conditions/time.py	95.23% <100.00%> (+0.50%)	⬆️
rocketry/core/log/adapter.py	100.00% <100.00%> (ø)
... and 7 more

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