Sunpy-soar

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- Registered a list of instruments available from the SOAR, with the ``a.Instrument`` attribute.
- Registered the SOAR in the ``a.Provider`` attribute, meaning that a user can specify to the Fido search to only query the SOAR by use of ``a.Provider.soar``.
- The ``_can_handle_query`` function within the SOARClient now checks to make sure if the SOAR supplies the queried data which fixes a bug which searched the SOAR for any data (e.g. AIA data).

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- Registered a list of valid data product identifiers with the ``a.soar.Product`` attribute.
To see these use ``print(a.soar.Product)``.

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- Added support for searching for and fetching low latency data.

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- Added support for path string interpolation, which allows you to do (for example)
``Fido.fetch(query, path=tmp_path / '{instrument}')`` and the name of the instrument will be used in the save path.
This works for all supported Fido attrs.

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- The ``Identifier`` attribute is deprecated - use ``Product`` instead, which is a direct replacement (with a better name!).
- Allow time-only searches to be made.
- Registered the ``Product`` attribute in the ``sunpy.net.attrs.soar`` namespace.
After running ``import sunpy.net.attrs as a``, the attribute can now be accessed using ``a.soar.Product``.
- The ``"Filesize"`` column in returned results now has units of ``astropy.units.Mbyte`` (previously it had no units).
- Removed a validation check on ``a.Level``.
If an level that SOAR doesn't understand is passed, zero results will now be returned instead of an error
being raised.

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- Fixed download of data where multiple versions of the requested file are available.
Only the most recent version will be downloaded.
- Added some log messages to the sunpy logger at DEBUG level