Properly deal with unused backend kwargs

[puddly]

Backend kwargs are a bit strange, especially with the central dispatchers:

1. Some kwargs are common to all backends.
2. Some kwargs are accepted only by some backends, including backends that may not import on the current platform.
3. Some kwargs are not accepted by any backends (i.e. typos).

This PR allows kwargs like low_latency=False to be passed through globally.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.44%. Comparing base (5b4fd47) to head (faa1afd).
⚠️ Report is 1 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #108      +/-   ##
==========================================
+ Coverage   92.35%   92.44%   +0.08%     
==========================================
  Files          22       22              
  Lines        3661     3704      +43     
==========================================
+ Hits         3381     3424      +43     
  Misses        280      280              

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