Resolve "The POST and query parameters of KrakenSpotBaseAPI and KrakenFuturesBaseAPI are not proper encoded in some case"

[btschwertfeger]

In February 2024, Kraken Kraken changed the way of validating payloads, which cased some tests of the scheduled workflow to fail. So I re-evaluated the whole encoding stuff. Together with "Peter" from the Kraken team, I found the route source of error and applied the required changes to fix those issues.

• fix the encoding for Futures
• improve encoding for Spot
• fix typos
• update pre-commit hooks

[codecov]

Codecov Report

Attention: Patch coverage is 94.73684% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 89.46%. Comparing base (55e7e0a) to head (0f6522b).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #189      +/-   ##
==========================================
- Coverage   89.73%   89.46%   -0.28%     
==========================================
  Files          21       21              
  Lines        1890     1879      -11     
==========================================
- Hits         1696     1681      -15     
- Misses        194      198       +4     

Flag	Coverage Δ
unittests	89.46% <94.73%> (-0.28%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
kraken/futures/__init__.py	100.00% <100.00%> (ø)
kraken/futures/trade.py	94.93% <ø> (-1.27%)	⬇️
kraken/futures/user.py	48.48% <ø> (ø)
kraken/futures/websocket/__init__.py	88.27% <100.00%> (ø)
kraken/futures/ws_client.py	87.50% <ø> (ø)
kraken/spot/__init__.py	100.00% <ø> (ø)
kraken/spot/funding.py	46.57% <ø> (ø)
kraken/spot/market.py	100.00% <ø> (ø)
kraken/spot/orderbook_v1.py	94.44% <ø> (ø)
kraken/spot/orderbook_v2.py	94.04% <ø> (ø)
... and 7 more