Aio-snowplow-tracker

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Fix: Do not send events multiple times when track calls are chained.

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Release asyncio Snowplow Python library.

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Breaking: Changed import from `snowplow_tracker` to `aio_snowplow_tracker` to support installing both libraries.

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Breaking: Emitter and Tracker leverage asyncio. `Tracker.track_*` calls must now be awaited.
Breaking: Remove AsyncEmitter. Use `asyncio.gather` instead.

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Breaking: Drop support for Python < 3.7

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Add Python 3.10 support (254)
Add configurable timeout for HTTP requests (258)