Zyte-autoextract

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* add ``--api-endpoint`` option to the command line utility
* improves documentation adding details about ``Request``'s extra parameters

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``autoextract.Request`` helper class now allows to set arbitrary
parameters for AutoExtract requests - they can be passed in ``extra`` argument.

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In this release retry-related features are added or improved.
It is now possible to fix some of the temporary errors
by enabling query-level retries, and the default retry behavior is improved.

* **backwards-incompatible**: autoextract.aio.ApiError is renamed
to autoextract.aio.RequestError
* ``max_query_error_retries`` argument is added to
``autoextract.aio.request_raw`` and
``autoextract.aio.request_parallel_as_completed`` functions; it allows to
enable retries of temporary query-level errors returned by the API.
* CLI: added ``--max-query-error-retries`` option to retry temporary
query-level errors.
* HTTP 500 errors from server are retried now;
* documentation and test improvements.

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* asyncio API is rewritten, to simplify use in cases where passing meta
is required. ``autoextract.aio.request_parallel_as_completed`` is added,
``autoextract.aio.request_parallel`` and ``autoextract.aio.request_batch``
are removed.
* CLI: it now shows various stats: mean response and connect time,
% of throttling errors, % of network and other errors
* CLI: new ``--intype jl`` option allows to process a .jl file
with arbitrary AutoExtract API queries
* CLI: new ``--shuffle`` option allows to shuffle input data, to spread it
more evenly across websites.
* CLI: it no longer exits on unrecoverable errors, to aid long-running
processing tasks.
* retry logic is adjusted to handle network errors better.
* ``autoextract.aio.request_raw`` and
``autoextract.aio.request_parallel_as_completed`` functions provide an
interface to return statistics about requests made, including retries.
* autoextract.Request, autoextract.ArticleRequest, autoextract.ProductRequest,
autoextract.JobPostingRequest helper classes
* Documentation improvements.

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* allow up to 100 elements in a batch, not up to 99
* custom User-Agent header is added
* Python 3.8 support is declared & tested

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Initial release.