component to monitor a task

[himdel]

(from https://hackmd.io/Dp-kVIjnTVeQVse2w2eC-w)

• A lot of operations in Pulp are performed asynchronously. Users are able to use the Tasks API to monitor progress of a an asynchronous task. Each task response contains start time, end time, and N number of progress reports. The Web UI for monitoring a task needs to periodically poll the Tasks API and update the UI with the latest information about the state and all the available progress reports. This UI component needs to be created first so it can be embedded into (or linked to from) all other UIs that need to show progress of an asynchronous operation.

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This mostly already exists in the form of Tasks / waitForTask / taskAlert, but it might be nice to have an inline component too, and unify with taskAlert to add polling.