Implement wait_for_pending_update method

[eskombro]

Based on this discussion, SDKs must provide a method that waits synchronously for an update to be processed by MeiliSearch.

Parameters:

• update_id: id of the update to be waited

Optional parameters:

• timeout_in_ms max number of millisecond this method should wait before rising a TimeoutError (default=2000ms)
• interval_in_ms number of millisecond to set an interval of time this method should wait (sleep) between requests (default=10ms)

tests

• Added wait_for_pending_update method in the Index class
• Added tests for default values, test for timeout and test for interval.

Closes #64

[curquiza]

Sorry for my shitty comments, so bad that the python linter does not see that. I feel more and more disappointed by this linter 😂

But there is still one important comment 😬

[bidoubiwa]

Could you add a test with interval = 0 ?

[bidoubiwa]

What does this line do?

[eskombro]

It uses the timedelta object to calculate the number of milliseconds since the moment the user called the wait_for_pending_update method. time_delta is an instance of a timedelta object, this just converts it to an int in ms

[eskombro]

Could you add a test with interval = 0 ?

@bidoubiwa whats would seem like a logical behaviour for you in that test? I don't really know what I could check other than if the function works or not

[eskombro]

It uses the timedelta object to calculate the number of milliseconds since the moment the user called the wait_for_pending_update method. time_delta is an instance of a timedelta object, this just converts it to an int in ms

[bidoubiwa]

@eskombro The only behavior is indeed for me that it should not crash. Since there are divisions going on I always prefer if the zero values are tested.