Cleanups to implementation of `create()`

[dstansby]

This cleans up the implementation of create() a bit by:

• Fixing the typing of filters
• Removing duplicate parsing of data type and compressor (the parsing is already done further down the call stack)
• Moving the parsing of filters to be in the same place (further down the call stack) as parsing of compressor

[d-v-b]

thank you for this cleanup work :pray:

[dstansby]

Since this seems uncontroversial, and has plenty of time for review, I'm going to self merge if CI passes.

[dstansby]

Bah, I can't self merge 😄 - can someone review please?

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 94.76%. Comparing base (23edb80) to head (d853cf0). :warning: Report is 121 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3111      +/-   ##
==========================================
+ Coverage   94.72%   94.76%   +0.04%     
==========================================
  Files          78       78              
  Lines        8646     8642       -4     
==========================================
  Hits         8190     8190              
+ Misses        456      452       -4     

Files with missing lines	Coverage Δ
src/zarr/api/asynchronous.py	87.50% <100.00%> (+1.00%)	:arrow_up:
src/zarr/api/synchronous.py	94.66% <ø> (ø)
src/zarr/core/array.py	98.46% <100.00%> (+<0.01%)	:arrow_up:

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