Implement basis of terminate and without_terminate

[kitsuyui]

Usage

without_terminate

without_terminate is a generator that it will not yield after the timeout,
but it will not raise an exception.

from timeout_iterator import without_terminate
results = []
for i in without_terminate(range(10), seconds=0.3):
    results.append(i)
    time.sleep(0.1)

assert results == [0, 1, 2]

terminate

terminate is a generator that it will raise an exception after the timeout.

from timeout_iterator import terminate
try:
    results = []
    for i in terminate(range(10), seconds=0.3):
        results.append(i)
        time.sleep(0.1)
except TimeoutError:
    pass

assert results == [0, 1, 2]

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